refactor: change pointer parameters to references for Level and Content in various classes

src/graphics/render/ChunksRenderer.cpp

@@ -35,7 +35,7 @@ public:
               settings.graphics.denseRender.get()
                   ? settings.graphics.chunkMaxVerticesDense.get()
                   : settings.graphics.chunkMaxVertices.get(),
-              *level.content,
+              level.content,
               cache,
               settings
           ) {
@@ -87,7 +87,7 @@ ChunksRenderer::ChunksRenderer(
     threadPool.setStopOnFail(false);
     renderer = std::make_unique<BlocksRenderer>(
         settings.graphics.chunkMaxVertices.get(), 
-        *level->content, cache, settings
+        level->content, cache, settings
     );
     logger.info() << "created " << threadPool.getWorkersCount() << " workers";
 }