Added a whole lot of stuff. Read description

-Carriages now spawn with either a shotgun, speed boost or no power up.
-Shotgun carriages appear red.
-Speedboost carriages appear yellow
-HUD displays power up of currently selected carriage
-HUD displays speed
-FOV is capped
-I hope nothing broke
Merge branch 'develop' of https://github.com/vox-populi/off-da-railz into develop