GPU: Fixed transparency for bottom-most 16-color BGs
GPU: Fixed tile flipping for 16-color BGs
GPU: Fixed tile flipping for alpha-blended 256-color BGs
GPU: Fixed alpha-blending for BGs with transparent pixels
GUI: FPS limiter toggling now works
GUI: Made the OpenGL texture format selectable
GUI: Added keyboard shortcuts for Run, Pause and Reset
GUI: The client area of the video output window should now be properly sized even for people with non-standard Windows themes