- new manager helpers to unload a theme and check a file's name validity
- new Get New.. button to start the KNS download dialog
- upon KNS completion we'll attempt to load all installed files as schemes
- for KNS entities which failed to load anything we'll show a warning as the theme is malformed
- for removal we'll first try to remove schemes through KNS to avoid its registry going out of sync with the on-disk "installedness" of an entity
- properly disable copying of the scheme manager (needs to be private)
FEATURE: 18.04.0
CHANGELOG: Support for downloading color schemes from the KDE store