[aprssig] New MSG-OBJ format (rev b)

[Charles Blackburn]

/me ducks the flying pans lol

i have accommodated for 3 characters between the [ ] which is a trivial 
change anyways. im still working on the parsing bit, outside of that 
everything is relatively simple, and as i've been working out the regexs' 
you'll se mesages flying back and forth :)

charlie