FT collision part2: added most of the FT collision system.

Aka "World's most expensive flippers".
This is an aggregate of collision-related changes made during 3DPB->FT transition.
The most important part is in flipper collision - a shift from monolithic iterative solver in TFlipperEdge::EdgeCollision to a distributed non-iterative solver.
Both 3DPB and FT data sets use FT collision, keeping two collision systems does not make much sense.
From user perspective, FT/3DPB systems should not have any major differences.

SpaceCadetPinball/maths.h

@@ -114,6 +114,7 @@ public:
 	static void cross(const vector3& vec1, const vector3& vec2, vector3& dstVec);
 	static float cross(const vector2& vec1, const vector2& vec2);
 	static float magnitude(const vector3& vec);
+	static float magnitudeSq(const vector2& vec);
 	static void vector_add(vector2& vec1Dst, const vector2& vec2);
 	static vector2 vector_sub(const vector2& vec1, const vector2& vec2);
 	static vector3 vector_sub(const vector3& vec1, const vector3& vec2);