Randomise moves of equal value

Merge remote-tracking branch 'upstream/main'

Fix clicks on pieces on hand registering as board clicks

Fixes #2

Merge remote-tracking branch 'upstream/main'

Implement move undo

Reduce search depth of minishogi slightly

Implement selection of western or japanese notation

Revert "Only allow a max of 9 held of each piece in custom games"

This reverts commit 88addf0.

Update grid when resizing custom game window

Fix incorrect castle checkbox being unchecked