Support all modes and support freq > 100MHz

Added support for all IC-746 modes, USB, LSB, CW, CWR, RTTY, RTTYR, AM, FM. Added support for frequencies greater than 100MHz.

Update for compatibility with new WSJTX Hamlib

What's Changed

• updated to respond with a nack for unimplemented commands by @awsh in #3

New Contributors

• @awsh made their first contribution in #3

Full Changelog: v1.0.1...V1.0.2

Updated library.properties

Corrected URL in library.properties

Initial release

Initial release of ICOM IC-746 CAT emulation library.