sentToPcBrick, preparing preStageActivity
worked on PcConnectionManager and Connection
started implementing custom keyboard
further work on customKeyboard
implemented last functionalities for sending a key (in PreStageActivity and SendToPcBrick
Version check: prestage checks if actual server- and client version are compatible
SendToPcActionTest, SendToPcBrickTest, SendToPcBroadcastTest, SendToPcConnectionTest, SimulatedDatagramSocket, SimulatedSocket added