Hanging Signs on Trapdoors

Hanging signs can now be attached to closed trapdoors, letting you build proper shop awnings, tavern boards and storefronts without floating blocks or awkward workarounds.

Once a sign is hanging below it, the trapdoor locks in place so your build stays put. Break the sign and the trapdoor works normally again.

Works with every wood type. No new blocks, no new items, no recipes: just one vanilla rule made slightly more reasonable.

Required on both client and server.