Small Selection and Views improvements.
Templates now creates elements centered in the screen.
Improves ImportElement action.
Reduces Assets#LOAD_TIME_SLOT_DURATION reducing the UI thread stuttering while loading big amounts of textures.
Improves TakePicture action and also Platform#askFotFile(...) method in Android.
PlayView loads the current game correctly.
Adds BrushStrokes.
Adds PaintToolbar.
Adds functionality to some buttons from the TopEditionToolbar.
Adds MockupSceneEditor.
Removed unused finals.
Merge pull request #731 from RotaruDan/editionView2

EditionView improvements.
WIP