Refactored MVC methods
corrected Chronometer in SoundFragment + Backpack
Select only NestingBricks in action mode
Merge pull request #767 from Catrobat/refactorLooks

Refactored MVC methods
remove black margins in standard project by scaling background and sprites and refactor ImageEditing
rearranged scaling so Md5-hash remains correct
Merge pull request #801 from Catrobat/DeleteNestedBricksFromTheOverflowMenu

Select only NestingBricks and nothing in between in copy and delete action mode
refactor resource handling, fix import of soundfile in standard project, refactor ImageEditing, fix tests and deactivate a BackPackSound test
Merge pull request #803 from Catrobat/refactorStandardProject

refactor standard project
change constants to enum
Merge pull request #805 from Catrobat/changeToEnum

change constants to enum
merge master