Player Trade - pandorical

Rebuilt for Minecraft 26.3.

• Sneak-click somebody who has already asked you, and the trade opens then and there instead of sending a second request back at them. Both of you are told whose ask it was.
• Asking twice is no longer spam. A second request at the same person says how long the first has left, on the action bar rather than in their chat, and there is a three-second pause before asking somebody else.
• A player on a controller is told which button opens the chat to answer, with couch-controls installed.
• Fixed: dying mid-trade destroyed what you had put up. The items come back to you before the death is dealt with, so they drop with the rest of your things, or stay under keepInventory.
• A trade only starts if both games can draw the screen. One side could open a trade the other could neither see nor get out of; now each is told plainly which of you is missing Pandorical.
• /trade accept with the wrong name says whose request you actually have, instead of doing nothing.