Add support for objects with tiles

assets/maps/test.tmj

@@ -374,7 +374,19 @@
          "draworder":"topdown",
          "id":31,
          "name":"Entities",
-         "objects":[],
+         "objects":[
+                {
+                 "gid":1322,
+                 "height":10,
+                 "id":19728,
+                 "name":"",
+                 "rotation":0,
+                 "type":"",
+                 "visible":true,
+                 "width":10,
+                 "x":1095.25,
+                 "y":405.75
+                }],
          "opacity":1,
          "type":"objectgroup",
          "visible":true,
@@ -405,7 +417,7 @@
          "y":0
         }],
  "nextlayerid":33,
- "nextobjectid":19728,
+ "nextobjectid":19729,
  "orientation":"orthogonal",
  "renderorder":"right-down",
  "tiledversion":"1.10.2",
@@ -418,6 +430,10 @@
         {
          "firstgid":298,
          "source":"..\/..\/tiled\/buildings.tsx"
+        }, 
+        {
+         "firstgid":1322,
+         "source":"..\/..\/tiled\/entities.tsx"
         }],
  "tilewidth":16,
  "type":"map",