CPU: Optimized Thumb emulation

CPU: Added support for mode changes on MOVS

CPU: The IntrWait SWI can now be interrupted even when IME=0 (as it would on a real DS)

GPU: Added support for main memory (FIFO) display mode

GPU: Modfied reference coordinate calculation for rotoscale OBJs

GPU: Fixed vertical OBJ clipping

GPU: Fixed a problem with 1D bitmap OBJ mapping

GPU: Fixed a bug where BGs would not be drawn if the VRAM selection bits in DISPCNT were non-zero

MMU: Fixed 16- and 32-bit writes to VRAMCNT_*

MMU: VRAM banks mapped to extended palettes are no longer accessible

GUI: Added an OBJ viewer

GUI: Added a map viewer (does not yet support all types of maps)

GUI: Improved the tile viewer (VRAM bank selection)

GUI: Changed the screenshot keyboard shortcuts to Ctrl+1..Ctrl+3 so as to not interfere with dialogs were entering numbers is needed