Add better follow camera

[tapanij]

Port from native tundra?
Sometimes it's a problem when the camera goes behind walls. In oulu scene its okay tho.

[tapanij]

https://github.com/stuntrally/stuntrally/blob/6ecba4add7713919d86e6a6c6d07f624b4e0f376/source/ogre/FollowCamera.cpp