Adds GridLayout.
Adds DraggableGridLayout.
Adds DraggableGridLayoutTest.
Sets dragActorPosition relative to the click.
Erases fling in DraggableScrollPane.
Format.
Merge pull request #684 from RotaruDan/SceneMap

Scene map
Merge pull request #689 from RotaruDan/draggableScrollPaneImprovements

Draggable scroll pane improvements
Removed annotation
Component and Effect shares Parameters as ancestor
Removed addanimation (use addcomponent with a tween instead)
Some resources updated
GoScene.name -> sceneId
New event index and some refactors in indexes
Actions for parameters. Some fixes in others actions
Pop-ups adquires the keyboard focus automatically
Renamed constant
Icons updated
Some constants
Several improvements in several widgets