Changed EXPAND_WCB so it works with MSVC and GCC

Changed EXPAND_WCB so it works with MSVC and GCC

- Required adding an "argument expansion macro" for each callback (hope to remove eventually)
- Fixed MSVC linking error where glutMenuStatusFuncUCall had the incorrect case and should've been glutMenuStatusFuncUcall
- Updated formatting of some freeglut_ext.h functions

git-svn-id: svn+ssh://svn.code.sf.net/p/freeglut/code/trunk/freeglut/freeglut@1810 7f0cb862-5218-0410-a997-914c9d46530a