Memory sticks/cards don't suit N+1 separate save files the way Linux's
filesystem does, so add an opt-in SAVE_DEVICE_DATA_RAW mode: settings and
all save slots get serialized to JSON, concatenated, zlib-compressed, and
framed with a magic/version/checksum/generation header, then read/written
as a single blob through one combined platform hook instead of four.
- PSP and Dolphin's SD/NAND backends write via a temp file + atomic rename,
so a crash mid-write can never leave a half-written save behind.
- GameCube memory cards have no rename or resize primitive, so they
ping-pong between two fixed files instead, picking whichever is valid and
has the higher generation counter on load.
- Linux is untouched (still four separate JSON files); saveslot.h/
savesettings.h drop their now-unnecessary pack(1) now that nothing
persists them as raw bytes.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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