[Editor] Enable basic game map serialization/deserialization

proto/src/main/proto/map.proto

@@ -0,0 +1,23 @@
+package com.bartlomiejpluta.base.proto;
+
+option java_package = "com.bartlomiejpluta.base.proto";
+option java_outer_classname = "GameMapProto";
+
+message GameMap {
+  required string name = 1;
+  required uint32 rows = 2;
+  required uint32 columns = 3;
+  repeated Layer layers = 4;
+}
+
+message Layer {
+  required string name = 1;
+
+  oneof layer {
+    TileLayer tileLayer = 2;
+  }
+}
+
+message TileLayer {
+  repeated uint32 tiles = 1;
+}