Demo - terrain offset and player scale offset — Unoffensible Steam update #626957

Thanks to player feedback, it was brought to my attention the game was non playable when the steamVR playspace had a floor height offset. To fix this there is now a player calibration station. This station will allow you to set the terrain height and your default scale. This allowed the removal of the "move terrain up/down" tutorial step. And the terrain can now no longer be moved during a mission. The player scale is mainly so the avatar matches your size, it has no effect on the gameplay. These values are also saved and loading from disk between play sessions. They are saved when you fail/succeed a mission. To reduce amount of disk writes. Today there was a short time where the build version was bugged due to the new changes. So a quick hotfix should have made the current version bug free again.