Add collisions to tileset

scripts/extract_tileset.py

@@ -20,7 +20,12 @@ def extract_by_property(tiles, key):
 
 def remove_properties(data, dst_file):
     data = json.loads(data)
-    new_tiles = [{'id': tile['id']} for tile in data['tiles']]
+    new_tiles = []
+    for tile in data['tiles']:
+        v = {'id': tile['id']}
+        if 'objectgroup' in tile:
+            v['objectgroup'] = tile['objectgroup']
+        new_tiles.append(v)
     data['tiles'] = new_tiles
     del data['wangsets']
     with open(dst_file, 'w') as f: