testing imageSource changed & etc.
code refactoring
Background Added.
ActingInputBox Added.
etc. 
test code or class are remained.
nothing special functional changes.
commit before refactoring.
separated each components.
Scene is now just a view without logic.
SceneShifter substitutes old Scene.
SceneShifter is a root sprite.
action button added. (take execution point for test)
etc, some refactoring.
added code for preview.
some refactoring.
git reset, cause of disconnecting accidently