speed up ContactPlane.get_distance()
speed up ContactPlane.get_distance()

- use dot product instead of frame rotation

RexFuzzle/sfepy,rc/sfepy,sfepy/sfepy,sfepy/sfepy,RexFuzzle/sfepy,vlukes/sfepy,RexFuzzle/sfepy,BubuLK/sfepy,BubuLK/sfepy,RexFuzzle/sfepy,sfepy/sfepy,BubuLK/sfepy,vlukes/sfepy,lokik/sfepy,lokik/sfepy,lokik/sfepy,lokik/sfepy,rc/sfepy,rc/sfepy,vlukes/sfepy