Turbo System

When landing after performing tricks the player will get an instant turbo. Turbos have 3 characteristics:

1. turboSpeedIncrement: The increment of the current speed. This is applied instantly. It is always the same.
2. turboDuration: The time the speed will be maintained at the max turbo speed.
3. turboDecceleration: How much the speed will drop every frame after turbo duration has passed until the max speed of the currentSpeedLevel is attained.

turboSpeedIncrement and turboDecceleration are constants. However, turboDuration is directly proportional to the trickPoints achieved before landing. It is calculated with the following formula:
 turboDuration = (trickPoints/scale)*turboDurationMax;

scale has to be defined once the trick point system is balanced.