- Add unicode and dead-key handling on Windows 32. Based on patch 2922403 from Jetro Lauha (tonic). Just we're now not using ToUnicode, but do stuff manually to support even older Windows systems.
- Add support for entering chars like @ with Alt Gr on non-US keyboards. Also from patch 2922403 by Jetro Lauha.
- Move unit globals into anonymous namespace in CIrrDeviceWin32.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@3088 dfc29bdd-3216-0410-991c-e03cc46cb475