[chirp_devel] Multiple icom sub models

[Marco Filippi IZ3GME]

Hi all!
I've seen the update on #280 and thought to implement it.
Making a class for IC-W32E derived from W32A is a couple of code lines 
BUT the two models would have the very same file format breaking the 
match_model magic

I looked at the W32A image and I don't identify any model signature in it.

Any suggestions?
I'm very tempted to add model id (4 bytes) at the end of new IC-W32E 
file ....

73 de IZ3GME Marco