[WIP] Flycam

THis is the first prototype of a flycam for screenshots.
Since I'm leaving Germany now I don't know how much I'll be able to do during this week.
If you need to take screenshots this is a good start, only problem left is the HUD.
For taikng videos, another gameplay-state is needed but since the flycam input is encapsulated it should work during a running game as well.