Merge branch 'bug/disable-coalescing-only-for-drawing' into develop

* bug/disable-coalescing-only-for-drawing:
  forgot to endstroke in erasertool
  disable coalescing only in actual drawing stroke tools
Make tabletEraserBackupMode of type ToolType

Add adjusttool (not entirely working yet)
Remove offset point from scribble area
Remove unused members