- Updated editor, and other area, styles to look okay in dark mode.
- Used tinyMCE theme generator to create dark mode theme.
- Updated tinymce to latest 4x version.
- Added fadeIn to animation JS service.
- Updated overlay to use anim service and to recieve a callback for
after-anim actions.
- Updated code editor popup to refresh Codemirror instance layout after
animation has completed.
Fixes#1672
- Codemirror mode mapping value can now be a function to dynamically set
mode depending on actual code content.
- Used above system to set php mode type, depending on if '<?php' tags
exist in content.
Closes#1557