chore: file QEMU, Roland, Chihiro and Oric

QEMU's 79 files go to QEMU/QEMU and Roland's four loose ROMs to MT-32
and CM-32L. The mt32-roms, soundcanvas-roms and sounddata trees stay as
the code addresses them. Chihiro joins Sega and the Oric joins
Tangerine, the names the site and libretro already use. No destination
held other bytes.

The three QEMU EDK2 images are release assets, and their .gitignore
lines follow them. Database and manifests are regenerated together.
verify --all and cross_reference give the same output once moved paths
are mapped.

.gitignore

@@ -49,9 +49,9 @@ bios/Nintendo/Nintendo DSi/DSi_Nand_KOR.bin
 bios/Nintendo/Nintendo DSi/dsi_nand.bin
 
 # QEMU EDK2 firmware (64MB each)
-bios/QEMU/edk2-aarch64-code.fd
-bios/QEMU/edk2-arm-code.fd
-bios/QEMU/edk2-arm-vars.fd
+bios/QEMU/QEMU/edk2-aarch64-code.fd
+bios/QEMU/QEMU/edk2-arm-code.fd
+bios/QEMU/QEMU/edk2-arm-vars.fd
 
 # ScummVM data bundle (79MB, fetched from large-files release)
 bios/ScummVM/scummvm.zip