Expand Configuration Options

This has been discussed, passingly, in PRs, issues, and in IRC itself. Just pasting some stuff here for future reference. Please feel free to expand in comments.

This issue is a collection of things that might be good things to include as configuration options for sopel-weather.

Below is a list of options I know to have been previously discussed. Please feel free to expand in comments.

• display only imperial, metric, or both
  • default should probably be both
• switch imperial or metric as the primary, non-parenthetical display
  • metric should probably be the default
• customize the output of weather
  • hide/replace the knot-related "breeze level" (e.g. "Light air" or "Hurricane")
  • use wind_gust instead of wind_speed (e.g. https://github.com/xnaas/sopel-weather/commit/9cae5b0e71cb94ed9f1c850702486c231c945687)
  • choose to display the "feels like" temperature
    • instead of normal? in addition to?

[dgw]

Having just thrown together #43, I know there is a "feels like" temperature option in the Open-Meteo API. For #11, that API also has a temperatureApparent field (same thing).

Similarly, both Open-Meteo and Tomorrow have wind-gust fields available, too.

The temperature stuff should all be handled on the plugin side from metric measurements retrieved from the API.