What's New:

- dsi/rsa: supports unencrypted "rsa" signatures (via hooked RSA swi functions)
- dsi/sdmmc: supports NDMA sdmmc start condition (for SD data32 read/write)
- dsi/sdmmc: supports SD card initialization (CMD0,2,3,7,8,9, ACMD6,13,41,42,51)
- dsi/sdmmc: created/included empty sd-card-image (file, in
- dsi/sdmmc: fixed irq-retriggering (recurse irq_stat on irq_mask changes)
- dsi/sdmmc: adjusts insert/eject and write-protect flags depending on
- dsi/sdmmc: prevents RXRDY in DATA32 mode (@@skip_rxrdy_in_data32_mode)
- dsi/help: added notes on EMPTY sd-image ( (DSi SD/MMC Images chapter)
- dsi/help: added notes unencrypted signatures (see BIOS RSA Functions chapter)
- dsi/help: added notes on encrypted twl-*.der files (in "verdata" NARC file)
- dsi/help: added CRC32 checksums for currently known/dump-able DSi-BIOS areas
- dsi/debug: shows insternal sd/mmc registers in iomap screen (cid,csd,csr,src)
- sample: updated magic floor gba/nds version, now with working dsi cart header