applyRelativeForce to apply a force relative to a body Position and Angle #1058
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Rationale
To build bodies that apply self forces (like rockets, powered wheels) you need to apply a force relative to a body.
This method simplify the applyForce method in these situations.
Visual Representation (not in scale)
applyForce
Applying a (0,1) force on position (1,1)
Applying a (0,1) force on a position (1,1) in a rotated body
applyRelativeForce
Applying a (0,1) relative force on relative position (0,-1)
Applying a (0,1) relative force on a relative position (0,-1) in a rotated body
