FlxAngle: Added angleFromFacing. FlxVelocity: DRY

Accelerate functions now take a single maxSpeed (instead of a maxSpeed separately in x/y)
What is the point of letting the function calculate the acceleration based on an angle but not the same for maxSpeed?
If you have to set the maxSpeed x/y separately, I suppose you want to do the same for acceleration. (vise-versa)