Merge remote-tracking branch 'ivan/brush2' into morevna

* ivan/brush2: (26 commits)
  Load brushes from MyPaint Paths to brushes should be added to settings manually By default uses paths to mypaint brushes in Ubuntu (for test)
  Fix bug with saving
  Fix bug with "add new frame" action
  Always have Children Lock enabled for GroupSwitch
  Paint at cairo surface
  Apply layers transformation for brush tool
  Add optional 'description' param to LayerEncapsulate action
  Wrap imported images by Switch Group. +Fix groups
  Enable animation bar for brush
  Action "Make New Frame" works without animation mode
  Improve ValueDescSet. Allow to animate param without animation mode.
  Allow to paint at Switch
  Select layer when Switch created
  Split "Make New Frame" action to "Make New Frame" and "Layer Copy"
  Layer_Switch::get_current_layer() method
  New action "Make New Frame"
  New action "Group Layers into Switch"
  Update references to Layer_PasteCanvas
  Derive two new classes from Layer_PasteCanvas - Group and Switch
  Saving of modified sprites
  ...

Conflicts:
	synfig-studio/src/gui/iconcontroller.cpp