Fix user clip planes. For D3D only a security measure in case plane3d changes. For OpenGL we fixed the user clip planes to world coords now. This is coherent with D3D usage and more natural. Bug fix suggested by heda.
I've also removed the clip plane upload from the projection matrix setting. I don't think it's needed there. At least my test cases don't need it. If someone finds a problem with this change, please report in the forum.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@4291 dfc29bdd-3216-0410-991c-e03cc46cb475