Added skin box hide bit functionality

Added code to hide skin boxes when wearing a helmet if bit for said functionality is present.

Minecraft.Client/PlayerRenderer.cpp

@@ -258,7 +258,9 @@ void PlayerRenderer::render(shared_ptr<Entity> _mob, double x, double y, double
 	{
 		for(ModelPart *pModelPart : *pAdditionalModelParts)
 		{
-			pModelPart->visible=true;
+			shared_ptr<ItemInstance> itemInstance = mob->inventory->getArmor(3);
+			if (itemInstance == nullptr || !pModelPart->hideWithHelmet)
+				pModelPart->visible=true;
 		}
 	}