[aprssig] old formats

[Andre PE1RDW]

With all the discussion about depreciated compressed objects I could not 
help but wonder one thing:
why the heck are we still suporting raw nmea strings, everyone knows 
that it is a waste of onair time and is only suported by old tnc´s that 
can be cheaply replaced by up to date trackers like tinytrack, 
opentracker etc.

If anything should be phased out it is that.

73 de Andre PE1RDW