- Added ECFN_DISABLED value (it works like ECFN_NEVER worked before) and changed ECFN_NEVER behaviour (it works like its equivalent value in OpenGL/Direct3D).

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@4424 dfc29bdd-3216-0410-991c-e03cc46cb475