Reduces threshold and distance tolerance in MockupImageProcessor.
Disables the collider drawing while playing in Mockup.
Improves SceneItem and ProjectItem. ScenesView and ProjectsView fixes.
Fixes BrushStrokes and MeshHelper.
Improves PaintToolbar functionality.
Improves MockupSceneEditor: disables multiple selection and nested group edition, pinch and zoom functionality, clipping, etc.
Adds ElementContext to the Edition view and associated functionality: clone, erase, toFront, toBack, etc.
Adds OthersWidget.
Some UI widgets improvements.
eAdventure Mockup skin improvements.
Views improvements.
Minor changes/fixes.
Some fixes after rebasing.
Merge pull request #734 from RotaruDan/editionView2

Drawing, Saving, Gestures and Element context improvements.