[chirp_users] TYT TH-8600 driver available for testing

A driver for the TYT TH-8600 is available for beta testing. It can be found attached to Issue 4851 https://chirp.danplanet.com/issues/4851 and can be tested via the "Load Module From Issue https://chirp.danplanet.com/projects/chirp/wiki/LoadingTestModules" option in the Help menu.

Support for 2 Tone, 5 Tone, and DTMF signalling is not yet fully implemented, but CTCSS and DTCS should be working.

Please report issues found during testing (or positive results) via the Issue or directly to me via email.

Thanks,

Andy