[chirp_devel] Adding TYT TH-7800 Support. Fixes #3477

[Dan Smith]

> Okay, I changed up the formatting and found one other section of code I
> forgot I wanted to change.  I also moved the common code to
> settings.py.  I also ran the unit tests and opened a few TH7800 img files.
> 
> LMK what you think.  Happy to explain my thoughts on any of the "common"
> stuff.

Can you send this to the list please? My patchbot pulls from there and
it's useful for other reviewers.

Thanks!

--Dan