What's new

A clearer definition of public/private functions.
Corrected code logic in theme/plugin installer with an array check.
Added hash_equals checks to prevent CSRF timing attacks.
Added link to WonderCMS homepage in the Settings panel.
Prettified code fixes.
Minor text changes to the Settings panel and error messages.
Removed old version support compatibility (function called updateOtherFiles).
CSS fix, removed bottom border on the settings panel links. The border was visible only when designing a new theme/template from scratch.
Functions re-sorted alphabetically for easier overview.
Added 404 page editing support.
Added whitelist for allowed file type uploads.
Restructured function for deleting files, themes and plugins.
Updated to latest version of taboverride and autosize.
Minor settings panel design changes.
Updated Summernote plugin to latest version and added tables to the Summernote editor toolbar.
Updated autosize.js to latest version.

2 plugins need updating

NOTE 1: If you don't have these plugins, there is no need to update them.
NOTE 2: Update WonderCMS before updating plugins.

Copy the link below and paste it in your Settings->Themes & plugins, select "Plugin" and click update.
https://github.com/robiso/wondercms-plugins/releases/download/Summernote/summernote.zip

Thanks to Vekien for the corrected code logic in the theme/plugin installer, helping implement hash_equals and restructuring the function for deleting files/themes/plugins.
Thanks to ayeshrajans for spotting the hash_equals improvement possibility.