Merge branch 'feature-green-basemap' into 'master'

Change basemap layer to have a black background and green land

See merge request cspp_geo/cspp-geo-web-viewer!31

mapserver/mapfiles/basemap.map

@@ -3,7 +3,7 @@ MAP
   STATUS ON
   MAXSIZE 5000
   SIZE 1024 1024
-  IMAGECOLOR 192 192 192
+  IMAGECOLOR 0 0 0
   IMAGETYPE png256
   EXTENT -5434894.885 -5434894.885 5434894.885 5434894.885
   FONTSET "/work/mapfiles/fonts.list"
@@ -42,7 +42,7 @@ MAP
       STYLE
         WIDTH 1
         OUTLINECOLOR 128 128 128
-        COLOR 255 255 255
+        COLOR 160 192 160
       END
     END
   END