[GB/CGB] BgB 1.5.1

BGB 1.5.1

• Fixed a number of bugs, including Donkey Kong Land and possibly other roms being broken, and a bug that caused it to sometimes not work on a secondary monitor.

New in BGB 1.5

• AVI writer
• Greatly improved efficiency (about 10-30% faster, depending on the system)
• Improved accuracy
• Improved sound quality
• Lower audio latency
• Preview screenshots in select state window
• Improvements to debugger, including selectable RGBDS or WLA assembler syntax, "ld d,d" debug messages, and editing the palette in the vram viewer.
• Fixed a large number of bugs, including "alt+F4 loads state", and "timing in LSDJ is unstable"