Several users have asked for the ability to set a custom name/description for frequencies that is displayed in the drop-down menu.

I have a version of this working, but there are some decisions we need to make before finalizing it.

1. The format of the saved frequencies in the configuration has changed. This requires us to create a new key in the configuration for the new format. Do we want to remove the old key from the saved settings, or let them stay? If we remove the key, and the user downgrades JS8Call, their custom frequencies will be lost.
2. In the drop-down menu, I chose to format the label like [Band]: [Freq] - [Desc]. We can do anything here, feedback is welcome.
3. I did not implement any validation or maximum length. We may want to do that, if so, we need to determine the rules.