CreateThumbnail action and test
Using stage batch instead of creating a new one.
Moved some cooldemo resources
Merge pull request #673 from anserran/thumbnailcreator

Create Thumbnail action, to create static images of model entities
Fix in tracker
Fixes #555
Fix fit
Component storing scene edition state
SceneEditor processing/updating the state
Added necessary methods to GroupEditor
Merge pull request #676 from anserran/scenestate

Component to remember scene panning and zoom across editions
Small default FocusItemStyle improvements.
Adds necessary actions and tests.
FocusItemList and LinearLayout improvements.
Renamed FramesTimelineTest to AnimationEditorTest.
Adds AnimationEditor.
Convenence methods and attributes.
FrameWidget refactoring (duplicate, delete, correctly managing the time...).
FramesTimeline refactoring. WOrks with selection, undo/redo, drag and drop...
Adds PreviewView, a view that holds an FramesComponent and displays/updates it when the model changes.