New skyboxrenderer + moved meshrenderer inside engine and out from main to clean that up

Assets/source/Debug.vert.hlsl

@@ -13,8 +13,8 @@ Output main(uint vertexIndex : SV_VertexID)
     // Retrieve the vertex buffer using SM6.6 bindless syntax
     ByteAddressBuffer buffer = ResourceDescriptorHeap[BufferIndex];
 
-    // TextureIndex is used as vertex offset for consolidated buffer (depth-tested at 0, overlay at halfMax)
-    uint actualVertexIndex = vertexIndex + TextureIndex;
+    // VertexOffset is used as vertex offset for consolidated buffer (depth-tested at 0, overlay at halfMax)
+    uint actualVertexIndex = vertexIndex + VertexOffset;
 
     // Vertex layout: float3 Position (12 bytes) + float4 Color (16 bytes) = 28 bytes stride
     uint stride = 28;