Support all `white-space` settings in the style sheet editor (see #4519)
Make `$this->inColumn` available in content elements and hybrids (see #5442)
Always check the `/templates` folder for customized templates (see #5547)
Pass the column name in the constructor in the `ContentModule` class
Re-add the missing table wizard resorting (see #5575)
Add a missing language variable in the install tool
Correctly update the `tl_files` table during the version 3.1 update (see #5598)
Allow to set the slider delay and speed in the wrapper element