shithub: puzzles

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ref: a9af3fda1d784c42d486a019a0a4e947f762af70
parent: b08c13f5f47a8541961fc150142523b061d3d9c6
author: Ben Harris <bjh21@bjh21.me.uk>
date: Sun Jun 4 14:42:58 EDT 2023

Rename UI_UPDATE as MOVE_UI_UPDATE

All the other constants named UI_* are special key names that can be
passed to midend_process_key(), but UI_UPDATE is a special return value
from the back-end interpret_move() function instead.  This renaming
makes the distinction clear and provides a naming convention for future
special return values from interpret_move().