Win32 UI: Some cleanup and simplification.

This does the following:
* Simplifies the menu translation code: it doesn't need to dictate if menu options are enabled or not, nor if items are checked. The menu bar automatically does these afterward anyway.
* Removes WM_USER_ATRAC_STATUS_CHANGED since it no longer has a menu item to change.
* Moves globalUIState editing to NewUI where it belongs(previously WndMainWindow was changing it, which is sort of a silly place to do it) when entering More Settings/Control Mapping.
* Remove dead code relating to ID_EMULATION_RENDER_MODE_OGL.
* Remove dead code relating to ID_EMULATION_RENDER_MODE_SOFT.
* Remove dead code relating to ID_EMULATION_ATRAC3_SOUND.