Merge pull request #78 from esper/master

Camera view can be changed during the game + lint fixes
Don't render the heightfield in debugdraw
Fixed ammo pickups to handle the case of no weapons

It just ignores the pickup in that case
Don't collect pickups if they cannot be collected

e.g. wrong weapon
Enabled dynamic vertical camera tilt when player is in first person view and has not entered a vehicle.
When in split game/multiplayer, do not reset the vertical angle for the other player when entering or leaving a vehicle.