- OUTPUT: Offload aspect ratio correction for Direct3D and OpenGL output modes from render code (these modes do it themselves)
- xBRZ: Also offload it when xBRZ scaler is enabled (xBRZ does not like line duplication and can do correction itself)
- OUTPUT: Store source aspect ratio translation parameters under 'sdl' structure, this may be used eventually for non-square pixel monitors aspect ratio correction
- xBRZ: Make sure xBRZ scaler honors aspect ratio correction flag in 'surface' mode of operation and controls aspect ratio correction offload when enabling/disabling itself
- xBRZ: Factor out scaling factor setup into its own function
- xBRZ: Fix up duplicated code path breaking 'surface' output
- MAIN: Split 'overlay' mode defaulting from primary 'if' set, making it simply choosing D3D/OGL/surface before primary 'if' goes
- DOC: README.xbrz
- DOC: clarify that SDL structure is initialized to zero in code comment, initialize defaults after memset()
