[gnome-maps] (6 commits) ...layersPopover: Add checkbox to toggle hybrid aerial

[Marcus Lundblad <mlundblad src gnome org>]

Summary of changes:

  33a9b6f... gschema: Add key for toggling hybrid aerial tiles (*)
  206defe... mainWindow: Add action for toggling hybrid aerial layer (*)
  9e21fdb... maps-service: Add hybrid aerial tiles for to the fallback s (*)
  932d730... mapSource: Add function to create hybrid aerial map source (*)
  47d56d5... mapView: Use hybrid aerial tiles when enabled (*)
  4927d91... layersPopover: Add checkbox to toggle hybrid aerial (*)

(*) This commit already existed in another branch; no separate mail sent