Make collision code placement more like original (+ small fixes)

# Conflicts:
#	premake5.lua
#	src/CMakeLists.txt
#	src/collision/Collision.cpp
#	src/core/Collision.h

src/collision/ColPoint.cpp

@@ -0,0 +1,16 @@
+#include "common.h"
+#include "ColPoint.h"
+
+CColPoint&
+CColPoint::operator=(const CColPoint &other)
+{
+	point = other.point;
+	normal = other.normal;
+	surfaceA = other.surfaceA;
+	pieceA = other.pieceA;
+	surfaceB = other.surfaceB;
+	pieceB = other.pieceB;
+
+	// no depth?
+	return *this;
+}