Move a bunch of math to cpp files + small fixes

# Conflicts:
#	src/control/CarCtrl.cpp
#	src/math/Matrix.h
#	src/math/Vector2D.h
#	src/math/math.cpp
#	src/render/Skidmarks.cpp

src/render/Glass.cpp

@@ -700,7 +700,7 @@ CGlass::WindowRespondsToExplosion(CEntity *entity, CVector point)
 
 	if ( fDistToGlass < 10.0f )
 	{
-		distToGlass.Normalise(0.3f);
+		distToGlass *= (0.3f / fDistToGlass); // normalise
 		WindowRespondsToCollision(object, 10000.0f, distToGlass, object->GetPosition(), true);
 	}
 	else

src/render/Skidmarks.cpp

@@ -215,10 +215,11 @@ CSkidmarks::RegisterOne(uintptr id, const CVector &pos, float fwdX, float fwdY,
 
 		aSkidmarks[i].m_pos[aSkidmarks[i].m_last] = pos;
 
-		CVector2D dist = aSkidmarks[i].m_pos[aSkidmarks[i].m_last] - aSkidmarks[i].m_pos[aSkidmarks[i].m_last-1];
-		dist.Normalise();
+		CVector2D right(aSkidmarks[i].m_pos[aSkidmarks[i].m_last].y - aSkidmarks[i].m_pos[aSkidmarks[i].m_last - 1].y,
+		                aSkidmarks[i].m_pos[aSkidmarks[i].m_last - 1].x - aSkidmarks[i].m_pos[aSkidmarks[i].m_last].x);
+
+		right.Normalise();
 		fwd.Normalise();
-		CVector2D right(dist.y, -dist.x);
 		float turn = DotProduct2D(fwd, right);
 		turn = Abs(turn) + 1.0f;
 		aSkidmarks[i].m_sideX[aSkidmarks[i].m_last] = right.x * turn * 0.125f;

src/render/WaterCannon.cpp

@@ -140,8 +140,7 @@ void CWaterCannon::Render(void)
 			if ( !bInit )
 			{
 				CVector cp = CrossProduct(m_avecPos[pointB] - m_avecPos[pointA], TheCamera.GetForward());
-				cp.Normalise(0.05f);
-				norm = cp;
+				norm = cp * (0.05f / cp.Magnitude());
 				bInit = true;
 			}