[chirp_devel] [uv-5r] test refactoring of uv5r.py

In order to get proper settings support in for BJ-UV55, I'm refactoring all of the code out of uv5r.py into separate bjuv55.py module. In the course of this, I'm also attempting to unify the settings structure of uv5r.py to make it easier to overload the memory map in subclasses/modules.

Jim, et al, with UV-5R radio to test, can you please verify attached uv5r.py does not adversely affect UV-5R?

Specifically I have merged the "extras" struct into settings:   u8 displayab:1,      unknown1:2,      fmradio:1,      alarm:1,      unknown2:1,      reset:1,      menu:1;   u8 vfomrlock;   u8 workmode;   u8 keylock;

I will be committing these in staged patches, but just need a sanity check on this first.

Thanks, Jens