Make a SpeedZone rotate

To make a SpeedZone rotate, just add the parameter "Rotate=" (or "R") and the speed in the level code.

  Examples:
  SpeedZone -1 0 -0.6 0 2000 Rotate=1
  SpeedZone 0 0 0 -0.5 5000 SnapEnabled Rotate=3.6 
  SpeedZone 1 0 0.6 0.3 3800 SnapEnabled Rotate=35 

  SpeedZone -1 0 -0.6 0 2000 R1 
  SpeedZone 0 0 0 -0.5 5000 SnapEnabled R3.6 
  SpeedZone 1 0 0.6 0.3 3800 SnapEnabled R35