Update TinyMCE to version 4.0.20
Simplify the RTE inclusion logic and adjust the config files to TinyMCE 4
Reduce the padding of the TinyMCE status bar
Adjust the "insert template" routines
Add a custom TinyMCE skin which integrates a bit more into the back end
Make the TinyMCE link and image dialogs work with the Contao page and file picker
Remove the old "typolinks" plugin
Add a tiny bit of contrast by changing the font color to `#444`
Update TinyMCE to version 4.0.20 (see #1495)
Merge branch 'feature/tinymce4' into develop

The feature set is now the same as it was before with TinyMCE 3.5. There are still some open feature requests, such as a link picker for files and news or the usage of UUIDs in image tags.