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

Refactored MVC methods
Merge pull request #801 from Catrobat/DeleteNestedBricksFromTheOverflowMenu

Select only NestingBricks and nothing in between in copy and delete action mode
Merge with master and conflict resolve