Fix a misspelled var.
Add functions for purge and creating the cache.
Cleanup code.
Merge branch 'origin/dev'
Update composer.json

Changed requirements from contao-legacy/dc_general to metamodels/dc_general
Extended file dialog (added option to select/unselect files by pattern)

Patch has originally been written by Ronny Binder <rbi@hinderlingvolkart.com>
Merge branch 'dev' of https://github.com/byteworks-ch/syncCto into dev