Add OSM Scout Server layers

Add the OSM Scout Server day & night layers & a new OSM Scout Server
group.

Note that for the layers to work correctly OSM Scout Server needs to be
running. On Sailfish OS this means starting the OSM Scout Server
applications. On other platforms you should first start the OSM Scout
Server console application.

Also don't forget to supply appropriate map data so that OSM
Scout Server has something to render the map layers from.

For more information about OSM Scout Server & about how to obtain
appropriate map data see:
https://github.com/rinigus/osmscout-server/blob/master/README.md

data/default_configuration_files/map_config.conf

@@ -1,6 +1,6 @@
 ## this config file configures the available map layers
 
-revision=24 ## configuration file revision
+revision=25 ## configuration file revision
 
 ## new layers use OSM style coordinates by default
 
@@ -661,6 +661,28 @@ revision=24 ## configuration file revision
   coordinates=web_mercator_substitution
   group="yandex"
 
+## OSM Scout Server
+## Layer definition for the OSM Scout Server offline map renderer.
+[[osmscout_day]]
+  label=OSM Scout Day
+  url="http://localhost:8553/v1/tile?daylight=1&z=${z}&x=${x}&y=${y}"
+  type=png
+  max_zoom=18
+  min_zoom=1
+  folder_prefix=osmscout_server_1
+  coordinates=web_mercator_substitution
+  group="osmscout_server"
+
+[[osmscout_night]]
+  label=OSM Scout Night
+  url="http://localhost:8553/v1/tile?daylight=0&z=${z}&x=${x}&y=${y}"
+  type=png
+  max_zoom=18
+  min_zoom=1
+  folder_prefix=osmscout_server_2
+  coordinates=web_mercator_substitution
+  group="osmscout_server"
+
 ## LL -> XY projection not yet working
 #[[cb_sec]]
 #  label=Sectional
@@ -748,3 +770,5 @@ revision=24 ## configuration file revision
 [[special]]
   label="Special maps"
 
+[[osmscout_server]]
+  label="OSM Scout Server"