Add missing test files, update IGeometryCreator.h.  Re-enable makeColorKeyTexture test - apologies if this is still borked on some platforms: please feel free to disable it again.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@2208 dfc29bdd-3216-0410-991c-e03cc46cb475