Added Feature: working for 3 or more people

We generalised our code so it now works for 3 or more people playing with an Oculus Quest. Even though the program itself doesn't have a limit to the number of people, there will be a limit on how many can move around without the Oculus getting confused. We couldn't test it with more than 3 devices, but we are quite sure that it will still work with at least 4 Quests even in a normal home environment.

The synchronization process is still a bit confusing as we are handling the input purely through hand gestures you simply have to know. We will work on some dialog that helps getting everything right.