Setup canvas size plugin
- kritapykrita_canvassize.desktop configured
- ViewExtension subclass created
- uicanvassize created
- QDialog subclass added to uicanvassize
- Widget to select documents
- QPushButton to refresh documents list
- Plugin added to CMakeLists.txt
Setup filter manager plugin
- kritapykrita_filtermanager.desktop configured
- ViewExtension subclass created
- uifiltermanager created
- QDialog subclass added to uifiltermanager
- Plugin added to CMakeLists.txt
Some adjusts in the color space plugin
Fixes T5885
Ref T1625