Test commit without rebasing, just to allow revision

amenity-points.mss and symbols/wilderness_hut.svg are ready for revision.

I have now changed the file naming of wilderness_hut.svg (with icon produced by @nebulon42) following @nebulon42's convention in #2451.

This commit also would like to help @jojo4u in testing his last update at #2459. I generated project.mml with Windows; I temporarily added the new yaml2mml.py, just to allow testing. Due to the inclusion of the new project.mml and new yaml2mml.py with this commit, please, do not merge by now.

amenity-points.mss

@@ -33,7 +33,7 @@
   [feature = 'amenity_shelter'][zoom >= 16] {
     marker-file: url('symbols/shelter-14.svg');
     [feature = 'tourism_wilderness_hut'] {
-      marker-file: url('symbols/wilderness-hut-14.svg');
+      marker-file: url('symbols/wilderness_hut.svg');
     }
     marker-fill: @transportation-icon;
     marker-placement: interior;

scripts/yaml2mml.py

@@ -24,10 +24,11 @@
     try:
         if not args.check:
             mml_file = open(mml_path, 'wb')
-            json.dump(yaml, mml_file, indent=2, separators=(',', ': '))
+            json_bytes = (json.dumps(yaml, sort_keys=True, indent=2, separators=(',', ': '))).encode(encoding="ascii")
+            mml_file.write(json_bytes)
             mml_file.close()
         else:
-            json.dump(yaml, sys.stdout, indent=2, separators=(',', ': '))
+            json.dump(yaml, sys.stdout, sort_keys=True, indent=2, separators=(',', ': '))
     except IOError:
         print('Could not save MML file. Aborting.')
         sys.exit(1)