Courier transformed

- SimpleQuadMesh holds a reference to its backing MemoryBlock so the
  cleaner doesn't drop it
- Fixes issue where meshes suddenly start rendering garbage

common/src/lib/java/dev/engine_room/flywheel/lib/model/SimpleQuadMesh.java

@@ -6,21 +6,25 @@
 
 import dev.engine_room.flywheel.api.vertex.MutableVertexList;
 import dev.engine_room.flywheel.api.vertex.VertexList;
+import dev.engine_room.flywheel.lib.memory.MemoryBlock;
 
 public final class SimpleQuadMesh implements QuadMesh {
 	private final VertexList vertexList;
+	// Unused but we need to hold on to a reference so the cleaner doesn't nuke us.
+	private final MemoryBlock data;
 	private final Vector4f boundingSphere;
 	@Nullable
 	private final String descriptor;
 
-	public SimpleQuadMesh(VertexList vertexList, @Nullable String descriptor) {
+	public SimpleQuadMesh(VertexList vertexList, MemoryBlock data, @Nullable String descriptor) {
 		this.vertexList = vertexList;
+		this.data = data;
 		boundingSphere = ModelUtil.computeBoundingSphere(vertexList);
 		this.descriptor = descriptor;
 	}
 
-	public SimpleQuadMesh(VertexList vertexList) {
-		this(vertexList, null);
+	public SimpleQuadMesh(VertexList vertexList, MemoryBlock data) {
+		this(vertexList, data, null);
 	}
 
 	@Override

common/src/lib/java/dev/engine_room/flywheel/lib/model/baked/MeshHelper.java

@@ -42,6 +42,6 @@ public static SimpleQuadMesh blockVerticesToMesh(BufferBuilder.RenderedBuffer bu
 		vertexView.ptr(dstPtr);
 		vertexView.vertexCount(vertexCount);
 
-		return new SimpleQuadMesh(vertexView, meshDescriptor);
+		return new SimpleQuadMesh(vertexView, dst, meshDescriptor);
 	}
 }

common/src/lib/java/dev/engine_room/flywheel/lib/model/part/ModelPartConverter.java

@@ -37,7 +37,7 @@ public static Mesh convert(ModelPart modelPart, @Nullable PoseStack poseStack, @
 
 		VertexView vertexView = new PosTexNormalVertexView();
 		vertexView.load(data);
-		return new SimpleQuadMesh(vertexView, "source=ModelPartConverter");
+		return new SimpleQuadMesh(vertexView, data, "source=ModelPartConverter");
 	}
 
 	public static Mesh convert(ModelLayerLocation layer, @Nullable TextureAtlasSprite sprite, String... childPath) {