CHIRP

I propose to make the following improvements to the th_uv88 driver :

Handling the vfo settings ("VFo Ch" tab from the original CPS)
Handling the Frequency range settings ("Frequency Range" tab from the original CPS)
Reorganize Basic/Advanced/Work mode settings in the UI (for exemple the 3 VOX settings are scattered around in 3 different place from 2 differents tabs). I would propose to group the settings in 3 categories : UI, Radio and Work mode
Other small fixes (scramble value 8 not handled properly)