Refactor look brick xmls

Refactored Look Bricks and applied styles (Issue #138).

Defined new styles as substyles of BrickContainer with Small, Medium, and Big dimension. Applied styles to all Look Bricks. Some tests failed because the old Brick heights were expected so thay were adapted. Also some java files had to be modified because some identifier were renamed to be consistent.
Testrun on Jenkins:
http://catrobatgw.ist.tugraz.at:8080/job/Catroid-custom-branch-test/204/
Single UI Tests after fixing test cases:
http://catrobatgw.ist.tugraz.at:8080/job/Catroid-single-UI-test/148/
http://catrobatgw.ist.tugraz.at:8080/job/Catroid-single-UI-test/150/