cutealien b10141887f obj/mtl loader no longer messes up bump textures when the name starts with a number
Mtl loader was assuming bump textures starting with a number are always using that to scale the bump.
No idea if there are mtl files out there assuming that, but usually scaling parameter is -bm
But it always assumed real filename was following, so as compromise I still allow pure numbers (no other characters following) to be scaling parameters.

Also mtl file can now handle map_Bump on top of map_bump and bump (NASA model assets use that sometimes)


git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@6602 dfc29bdd-3216-0410-991c-e03cc46cb475
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