[chirp_devel] Add new radio Icom IC-E90/T90/T90A

[Dan Smith]

> sorry for delay, attached is the radio patch. I have been testing it for
> few months and updated it to fix problems I have encountered.

Okay, applied. This isn't bytes()-compatible with py3, but since I previously ack'd it and said I'd apply it as it was before I started asking people to make them byte-compatible, I went ahead with it. If you happen to have time to do that conversion (see tk8180.py for an example) that'd be nice.

Thanks!

--Dan