Add another conversion.

src/map.rs

@@ -28,6 +28,12 @@ pub struct Area(pub AABB);
 #[derive(Component, Clone, Default, Deref, DerefMut)]
 pub struct Map(pub MapgenMap);
 
+impl From<MapgenMap> for Map {
+    fn from(v: MapgenMap) -> Self {
+        Self(v)
+    }
+}
+
 #[derive(Component, Clone, Debug, Default, Reflect)]
 #[reflect(Component)]
 pub struct MapObstruction;