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add matrix flip/reflect behavior on X

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Original file line number	Diff line number	Diff line change
`@@ -156,6 +156,16 @@ static public Coords Shear(Coords position, Vector3 shear)`
`156`	`156`	`return mQ.AsCoords();`
`157`	`157`	`}`
`158`	`158`
	`159`	`+ static public Coords ReflectX(Coords position)`
	`160`	`+ {`
	`161`	`+ Matrix mQ;`
	`162`	`+ Matrix mR = new Matrix(4, 4, new float[16] { -1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1 });`
	`163`	`+ Matrix mP = new Matrix(4, 1, position.AsFloats());`
	`164`	`+`
	`165`	`+ mQ = mR * mP;`
	`166`	`+ return mQ.AsCoords();`
	`167`	`+ }`
	`168`	`+`
`159`	`169`	`static public Coords Cross(Coords vector1, Coords vector2)`
`160`	`170`	`{`
`161`	`171`	`float xMult = vector1.y * vector2.z - vector1.z * vector2.y;`

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