Fix all Bugs in PreviewController

One Method is not ready implemented (RemoveSource)
Fix All in PreviewController & removes the testMethods out of EditorWindow
Merge branch 'UnitTestPreview' - PreviewController is fixed and issue should close!
change type of augmentations in AbstractTrackable to List<AbstractAugmentations>

change some stuff which results of this change
add Attribe to AbstractAugmentation: public AbstractTrackable trackable { get; set; }
Merge branch 'master'