MQTT Credentials & Bugfix release

Breaking changes:

• Please update your config files according to the changes below. An example config file gorigctl.toml is included in the repo.

This version includes the following changes:

• fixed Issue 3: invalid rig model
• added pflags for MQTT username, password and clientID, see: Issue 2: mqtt username password
• harmonised all pflags & parameters in config files to use hyphens - instead of underscores _ for multi-word parameters
• added hamlib debug pflag (--hl-debug-level) for the mqtt server
• when printing rig caps, the values for powerst, ant, rit, xit, split, tuning step, ptt will be shown now
• added more detailed log messages for functions / levels / parameters on the mqtt server
• changed default broker from localhost to test.mosquitto.org
• in the config file, in the section mqtt the keys username, password, client-id have been added
• in the config file, the section [general] was removed
• in the config file, some keys which contained an underscore where replaced by hyphens

Initial release

This is the first release, consider it beta.

Any feedback is welcome!