[chirp_devel] Icom ic-7300 new driver

The CLONE MODE version of the ic7300 driver. The IC-7300 does not respond to the icf clone mode code. I removed my debug test code and changed the BAUD parameter to a radio property. This driver uses CAT commands to build an equivalent clone mode img file. The operators I know HATE using live mode when their radios have more than 10 memory channels. The special encode and decode methods are required because this radio sends frequency data as strings of reverse HEX values, not lbcd, but lhcd, if such a thing exists.