Test commit (rebased), 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 gravitystorm#2451.

This commit also would like to help @jojo4u in testing his last update at gravitystorm#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.

______________________________________________________________________

**Rendering of tag tourism=wilderness_hut**

Latest changes:

- Use wilderness-hut.svg icon by @nebulon42
- Rebased to master

______________________________________________________________________

To summarize, the following different kind of huts have specific symbols now:

- amenity=shelter (only shown at zoom >=16)
- tourism=alpine_hut  (not modified within this drop)
- tourism=wilderness_hut (zoom>=13)

Symbols:
- wilderness_hut: symbols/wilderness_hut.svg (new)
- alpine_hut: symbols/alpinehut.p.16.png (unmodified)
- generic shelter: symbols/shelter.svg (unmodified)

amenity-points.mss

@@ -29,8 +29,12 @@
     point-placement: interior;
   }
 
+  [feature = 'tourism_wilderness_hut'][zoom >= 13],
   [feature = 'amenity_shelter'][zoom >= 16] {
     marker-file: url('symbols/shelter.svg');
+    [feature = 'tourism_wilderness_hut'] {
+      marker-file: url('symbols/wilderness_hut.svg');
+    }
     marker-fill: @transportation-icon;
     marker-placement: interior;
     marker-clip: false;
@@ -1741,6 +1745,7 @@
   [feature = 'tourism_hostel'][zoom >= 17],
   [feature = 'tourism_chalet'][zoom >= 17],
   [feature = 'tourism_guest_house'][zoom >= 17],
+  [feature = 'tourism_wilderness_hut'][zoom >= 14],
   [feature = 'tourism_camp_site'][zoom >= 17] {
     text-name: "[name]";
     text-size: @standard-text-size;
@@ -2257,4 +2262,3 @@
     }
   }
 }
-