Changes since official release (3.9 / 1.37)

- Fixed RGB mode (U64 only)
- Fixed block read command
- Fixed access of files with special chars in CBM disk images, accessed from IEC
- Fixed UCI issues with SidPlay and others
- Fixed colon issue in Ultimate Kernal ROM
- Fixed crash on invalid file chain CBM filesystems
- Fixed check order DIR / VOLUME; fixes some issues with exFAT directories
- Added M and V commands in modem emulation layer, V now supporting numeric responses. Thanks tlar54!
