Initial Contribution for OH2 Max!Cube binding

Signed-off-by: Marcel Verpaalen <marcel@verpaalen.com>
I agree that it  would be better. 
I made it in the current way to re-use the logic from the hue bridge, MaxCubeBridge is basically all old OH1 code, whereas MaxCubeBridgeHandler is the new OH2 stuff. If I go and merge it, then I want to do further enhancement to refactor the socket communication to a separate class, and at the same time implement the possibility for the persistent connection.

However, that I will certainly not manage this weekend or the coming week.