Intermediate refactor to move everything over to using the textures module rather than everyone using one TexturePack thing.

guecs.cpp

@@ -28,7 +28,7 @@ namespace guecs {
     }
   }
 
-  void UI::init(TexturePack& textures) {
+  void UI::init() {
     if($world.has_the<Background>()) {
       auto& bg = $world.get_the<Background>();
       bg.init();
@@ -59,7 +59,7 @@ namespace guecs {
     });
 
     $world.query<lel::Cell, Sprite>([&](auto, auto &cell, auto &sprite) {
-        sprite.init(cell, textures);
+        sprite.init(cell);
     });
   }