Met alle subclasses
Merge remote-tracking branch 'origin/master'

Conflicts:
	TetrisTemplate/TetrisPrac.v12.suo
	TetrisTemplate/bin/x86/Debug/TetrisPrac.exe
	TetrisTemplate/bin/x86/Debug/TetrisPrac.pdb
	TetrisTemplate/obj/x86/Debug/TetrisPrac.exe
	TetrisTemplate/obj/x86/Debug/TetrisPrac.pdb