Garmin watches support

This was brought up already sometimes before (years? :) ), but maybe it's worth another idea suggestion.

It would be amazing to have support for Garmin watches/devices (very - and increasingly - popular with hikers) - in both directions:

* Sync tracks from the watch to Gaia GPS

* Send tracks from Gaia GPS mobile app directly to the watch

* Ideally, be able to get in sync with current (in progress) activity being recorded on watch and display in Gaia mobile app.