[spa77k]

Closes #800.

Updates the persistent view example in the Menu Type API page:

• Store the views keyed by the player's UUID instead of the Player object, and look them up with getUniqueId() in the command and quit handler.
• Add an InventoryClickEvent handler that checks event.getView() against the stored view, as an example of identifying which menu a player is interacting with. It stops shulker boxes from being put into the stash by placing from the cursor, swapping with the cursor, shift-clicking, or using the number/offhand keys (getHotbarButton() is -1 for the offhand swap).
• Add a note that dragging items fires InventoryDragEvent instead, which has to be handled separately.

Verification:

• Checked each InventoryAction that can move an item into the top inventory against the Paper Javadoc.
• git diff --check passed.

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