[Editor] Enable basic serialization for object and image layers

The layers' properties are not serialized/deserialized yet. All the protos for object layer and image layer contains actually nothing except the layer name in Layer proto container.

game/src/main/java/com/bartlomiejpluta/base/game/map/serial/ProtobufMapDeserializer.java

@@ -31,6 +31,10 @@ public class ProtobufMapDeserializer extends MapDeserializer {
    private void deserializeLayer(GameMap map, GameMapProto.Layer proto) {
       if (proto.hasTileLayer()) {
          deserializeTileLayer(map, proto);
+      } else if (proto.hasObjectLayer()) {
+         deserializeObjectLayer(map, proto);
+      } else if (proto.hasImageLayer()) {
+         deserializeImageLayer(map, proto);
       } else {
          throw new AppException("Not supported layer type");
       }
@@ -51,4 +55,12 @@ public class ProtobufMapDeserializer extends MapDeserializer {
          }
       }
    }
+
+   private void deserializeObjectLayer(GameMap map, GameMapProto.Layer proto) {
+      var layer = map.createObjectLayer();
+   }
+
+   private void deserializeImageLayer(GameMap map, GameMapProto.Layer proto) {
+      // TODO(return new ImageLayer(...))
+   }
 }