[chirp_devel] FT-7800 memory banks

I've got an FT-7800, and have figured out how banks are stored. Starting at 0x6c48, there's a 128 byte bitmap for each bank. Byte 17 is set if channel 17 belongs to the bank, etc. There is no flag telling which banks are in use.

Banks are named BANK 1 .. BANK20, but these names are immutable, i.e. they aren't stored in the image, so the user cannot change them. The chirp UI should show them as immutable.

Patch attached for the curious. Dan, once you get back from Dayton, will you want the Yaesu memory bank patches as a single patch or one patch per radio?

Regards

Jon LA4RT