Removed old icons
Added group and ungroup actions
Added group and ungroup buttons
Merge pull request #837 from gorco/group

Group and ungroup
New LWJGL application initialization.
Sets continuous rendering to false.
Merge pull request #838 from RotaruDan/continuourRendering

Non continuous rendering
Undo/Redo in insert
Moved draw things to draw package
Navigation only appears when no selection
Minor fix
Animations for mirroring
Animations for transformations
Save in pause
Refactored ShowToast and Views
Show tooltip action
Added tooltip to widget builders
Tooltips for the current UI
Improved rotation gesture
Animations when adding/deleting actors