Super Game Boy / GB emulation fixes:
This release fixes alot of games that uses Mappers as well as some games that are not playable on all emulators (like Messen)
GB PPU hardware correctness
- STAT IRQ hardware quirks (LCD-off guard, LY=153 edge case) — fixes Zerd no Densetsu boot
- DMG STAT-write quirk now only fires on newly-enabled source bits
- Mode 3 sprite stall + WX latching — fixes One Piece dialog torn edges
- BGP latch at mode 2→3 boundary — try-fix for split-scanline palette glitch
- SCX-fine mode-3 penalty modeled (per-scanline raster timing)
Cart mappers support
- Sachen MMC1 mapper + scrambled-logo detection (Sachen 4 in 1 4B-007 boot)
- Sachen BIOS-mode boot fix: value-gated unlock + MbcRead synth path
- MMM01 multicart mapper added (Mani / Taito 4-in-1)
- MMM01 sub-game SGB palette injection (no splash)
- Cart MBC now resets on File → Reset (Sachen 4B-007 no-cartridge post-reset)
- Cart SRAM defaults to $FF instead of $00 — fixes Initial D Gaiden text rendering
Audio:
- Independent GB volume slider in BIOS-less SGB mode enabled