move OWBlockset and OWMapTiles

src/app/zelda3/common.h

@@ -9,6 +9,21 @@ namespace app {
  */
 namespace zelda3 {
 
+/**
+ * @brief Represents tile32 data for the overworld.
+ */
+using OWBlockset = std::vector<std::vector<uint16_t>>;
+
+/**
+ * @brief Overworld map tile32 data.
+ */
+struct OWMapTiles {
+  OWBlockset light_world;    // 64 maps
+  OWBlockset dark_world;     // 64 maps
+  OWBlockset special_world;  // 32 maps
+};
+using OWMapTiles = struct OWMapTiles;
+
 /**
  * @class OverworldEntity
  * @brief Base class for all overworld entities.