Our weather integration should follow GNOME Weather as closely as
possible, which means that we should respect its location permission
rather than using our own or none at all (which we can as a "system"
component and as geoclue's authorization agent).
https://bugzilla.gnome.org/show_bug.cgi?id=780252
It doesn't make sense to tie the proxy code for flatpak's permission
store to the location indicator, just because that was the first
component to use it, so split it into a separate module.
https://bugzilla.gnome.org/show_bug.cgi?id=780252
