Currently we only have SpaceCenter.LoadSpaceCenter which switches to the space center scene. We should add support for switching to any of the game scenes. There is also KRPC.CurrentGameScene for getting the game scene. (Note this is in the KRPC service, as the core server needs to know the game scene so that RPC availability can be filtered by the current game scene)

We should remove the above, and just have a property called KRPC.GameScene that allows you to both get and set the game scene.