CWinapiEventManager::processWinapiEvent(...) is cleansed.

Signed-off-by: Stanislav Demyanovich <stan@angrybubo.com>
Draft: minor modification of IGfxManager interface.

Signed-off-by: Stanislav Demyanovich <stan@angrybubo.com>
Draft: stub for COpenglGfxManager.

Signed-off-by: Stanislav Demyanovich <stan@angrybubo.com>