[ticket/63881] Let's get it to actually work this time...
Fix cache service.
Remove PM popup remnants no longer in use.
Fix call to undefined function on_page().
Fix strict standards error.
Fix conflict remnants.
Fix template.
Rename default style to prosilver.
Move composer.json and ext.php to main directory.
Start process of turning Titania into an extension by removing custom template
items.
Update permissions language file to new format.
Remove "enhanced" editor features.
Fix misplaced ENDIF.
Fix template block END that's not being recognized by Twig.
Fix strict standards error.
Rename licence field to license in composer.json.
Split permissions into Titania & Titania Moderate categories.
Bump the version to 2.0-dev.
Fix FAQ list block.
Drop duplicate/outdated javascript files.