Refactor remove unused broadcast messages.
Merge branch 'master' into Refactorazione
Change unused broadcast message set to list.
Refactor BroadcastBrick and MessageContainer.
Add broadcast message parameter to BroadcastBrick constructor.
Refactor BroadcastXYZ
Refactor broadcast message engine.
Refactor BroadcastBricksTest
Fix null pointer exception in MessageContainer.getPositionOfMessageInAdapter.
Remove unnecessary set spinner position
Rename broadcastmessage for compatibility
Revert BroadcastReceiverBrick to lazy initialization
Merge branch 'master' into fixBroadcastMessages

Conflicts:
	catroid/src/org/catrobat/catroid/content/Project.java
Merge pull request #471 from Catrobat/fixBroadcastMessages

Fix broadcast messages