Set individual styles for map overlays, depending on their LocationProvider

Signed-off-by: mvglasow <michael -at- vonglasow.com>
Use Mapquest tiles in map view

Signed-off-by: mvglasow <michael -at- vonglasow.com>
Always show markers, remove old comments from code

Signed-off-by: mvglasow <michael -at- vonglasow.com>
Reduce default zoom to 16

Signed-off-by: mvglasow <michael -at- vonglasow.com>