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

[Charles Blackburn]

While it doesn't support it yet, how are we going to delineate things like
course and speed.

I'm assuming we can do the following

OBJECT   : MYOBJECT [\s] this is an object with a symbol
OBJECT   : MYOBJECT [] this is an object without a symbol and use "X" 
OBJECT   : MYOBJECT [\s] CSE060/070/ this is an object with a symbol and a
course/speed 
OBJECT   : MYOBJECT [\s] PHG756936 this is an object with a symbol and a PHG

Just trying to work out the true format with an example so I can create the
parser.

At the moment my server will accept the messages and parse them, but not
create the objects (disabled atm)

Charlie