Upgrading to PHP 7 With Fortuna Theme

I would like to upgrade but your theme and plugins get several warnings and errors. Please let me know how to fix these.

Thanks

FILE: /nas/content/staging/coderz/wp-content/themes/fortuna/page.php
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FOUND 0 ERRORS AND 1 WARNING AFFECTING 1 LINE
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1 | WARNING | File has mixed line endings; this may cause incorrect results
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FILE: /nas/content/staging/coderz/wp-content/themes/fortuna/includes/ext/option-tree/includes/ot-cleanup-api.php
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FOUND 0 ERRORS AND 2 WARNINGS AFFECTING 2 LINES
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126 | WARNING | INI directive ‘safe_mode’ is deprecated since PHP 5.3 and removed since PHP 5.4.
280 | WARNING | INI directive ‘safe_mode’ is deprecated since PHP 5.3 and removed since PHP 5.4.
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FILE: /nas/content/staging/coderz/wp-content/themes/fortuna/includes/boc_widgets.php
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FOUND 0 ERRORS AND 2 WARNINGS AFFECTING 2 LINES
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17 | WARNING | Use of deprecated PHP4 style class constructor is not supported since PHP 7.
97 | WARNING | Use of deprecated PHP4 style class constructor is not supported since PHP 7.
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FILE: /nas/content/staging/coderz/wp-content/plugins/parallax_video_backgrounds_vc/assets/css/index.php
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FOUND 0 ERRORS AND 1 WARNING AFFECTING 1 LINE
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1 | WARNING | File has mixed line endings; this may cause incorrect results
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FILE: /nas/content/staging/coderz/wp-content/plugins/parallax_video_backgrounds_vc/assets/images/index.php
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FOUND 0 ERRORS AND 1 WARNING AFFECTING 1 LINE
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1 | WARNING | File has mixed line endings; this may cause incorrect results
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FILE: /nas/content/staging/coderz/wp-content/plugins/parallax_video_backgrounds_vc/assets/img/index.php
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FOUND 0 ERRORS AND 1 WARNING AFFECTING 1 LINE
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1 | WARNING | File has mixed line endings; this may cause incorrect results
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FILE: /nas/content/staging/coderz/wp-content/plugins/parallax_video_backgrounds_vc/assets/js/index.php
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FOUND 0 ERRORS AND 1 WARNING AFFECTING 1 LINE
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1 | WARNING | File has mixed line endings; this may cause incorrect results
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FILE: /nas/content/staging/coderz/wp-content/plugins/parallax_video_backgrounds_vc/assets/index.php
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FOUND 0 ERRORS AND 1 WARNING AFFECTING 1 LINE
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1 | WARNING | File has mixed line endings; this may cause incorrect results
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FILE: /nas/content/staging/coderz/wp-content/plugins/parallax_video_backgrounds_vc/admin/auto-update/index.php
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FOUND 1 ERROR AFFECTING 1 LINE
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779 | ERROR | Extension ‘mysql_’ is deprecated since PHP 5.5 and removed since PHP 7.0 – use mysqli instead.
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FILE: /nas/content/staging/coderz/wp-content/plugins/parallax_video_backgrounds_vc/admin/bsf-core/auto-update/index.php
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FOUND 1 ERROR AFFECTING 1 LINE
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884 | ERROR | Extension ‘mysql_’ is deprecated since PHP 5.5 and removed since PHP 7.0 – use mysqli instead.
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FILE: /nas/content/staging/coderz/wp-content/plugins/js_composer/include/templates/teaser.html.php
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FOUND 0 ERRORS AND 1 WARNING AFFECTING 1 LINE
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84 | WARNING | Possible use of ASP style opening tags detected. ASP style opening tags have been removed in PHP 7.0. Found: <%= id %>” src=”<%= url %>”…
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FILE: /nas/content/staging/coderz/wp-content/plugins/js_composer/include/templates/editors/partials/backend-shortcodes-templates.tpl.php
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FOUND 0 ERRORS AND 3 WARNINGS AFFECTING 3 LINES
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44 | WARNING | Possible use of ASP style opening tags detected. ASP style opening tags have been removed in PHP 7.0. Found: <%= type %>”>
45 | WARNING | Possible use of ASP style opening tags detected. ASP style opening tags have been removed in PHP 7.0. Found: <%= heading %></div>
47 | WARNING | Possible use of ASP style opening tags detected. ASP style opening tags have been removed in PHP 7.0. Found: <%= form_element %>
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FILE: /nas/content/staging/coderz/wp-content/plugins/js_composer/include/templates/editors/popups/shared-templates/category.tpl.php
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FOUND 0 ERRORS AND 12 WARNINGS AFFECTING 12 LINES
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134 | WARNING | Possible use of ASP style opening tags detected. ASP style opening tags have been removed in PHP 7.0. Found: <%- post_id %>”
135 | WARNING | Possible use of ASP style opening tags detected. ASP style opening tags have been removed in PHP 7.0. Found: <%- title %>”
141 | WARNING | Possible use of ASP style opening tags detected. ASP style opening tags have been removed in PHP 7.0. Found: <%- title %></button>
149 | WARNING | Possible use of ASP style opening tags detected. ASP style opening tags have been removed in PHP 7.0. Found: <%- post_id %>"]” titl…
160 | WARNING | Possible use of ASP style opening tags detected. ASP style opening tags have been removed in PHP 7.0. Found: <%- id %>”>
162 | WARNING | Possible use of ASP style opening tags detected. ASP style opening tags have been removed in PHP 7.0. Found: <%- thumbnailUrl %>” alt=”"…
165 | WARNING | Possible use of ASP style opening tags detected. ASP style opening tags have been removed in PHP 7.0. Found: <%- previewUrl %>” data-tit…
167 | WARNING | Possible use of ASP style opening tags detected. ASP style opening tags have been removed in PHP 7.0. Found: <% if (!downloaded) { %>
171 | WARNING | Possible use of ASP style opening tags detected. ASP style opening tags have been removed in PHP 7.0. Found: <% } else if (downloaded &&…
175 | WARNING | Possible use of ASP style opening tags detected. ASP style opening tags have been removed in PHP 7.0. Found: <% } %>
180 | WARNING | Possible use of ASP style opening tags detected. ASP style opening tags have been removed in PHP 7.0. Found: <%- title %></span>
182 | WARNING | Possible use of ASP style opening tags detected. ASP style opening tags have been removed in PHP 7.0. Found: <%= status %>
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FILE: /nas/content/staging/coderz/wp-content/plugins/js_composer/js_composer.php
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FOUND 1 ERROR AFFECTING 1 LINE
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220 | ERROR | Visibility for magic method __sleep must be public. Found: private
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Update Available: 5.0.1; Current Version: 5.0;