BT: fixed check for header of packet. Now also checks length. Refactored for future addiotion of 'external device' packets
Proximity Sensors: Ignoring reportet '0' distance samples if average of samples is high enough
Formating changes
Merge branch 'albert_robot_tobi' into albert_robot

Conflicts:
	catroid/src/org/catrobat/catroid/robot/albert/RobotAlbertBtCommunicator.java