TClipProjectionMatrix

Realigns the near plane for an existing projection matrix with an arbitrary clip plane from: [http://sourceforge.net/mailarchive/message.php?msg_id=000901c26324%242181ea90%24a1e93942%40firefly](http://sourceforge.net/mailarchive/message.php?msg_id=000901c26324%242181ea90%24a1e93942%40firefly) Updated for the fact that our FPlane uses Ax+By+Cz=D.