• Added movement animation and animation SPEED button (animation speed of 0 disables it)
• Added option to remove UNDO and SPEED buttons from GUI by setting their slot to -1 in config
• Implemented DRY moveItemsInDirection()
• Implemented DRY undo_button_slot & speed_button_slot
• Fixed ConfigKey.getIntValue() and thus fixed the UNDO button
• Added support for empty config strings (messages and lore)
• Added score variable to game GUI title, use with %s
• Combined "Your Position" message with player's position index
• Renamed Direction -> ButtonAction (+ added actions)
• Renamed & sorted config options
• Supplied alternative default config
• Fixed some small bugs and potential bugs
• More changes we forgot to list

THE OLD CONFIG MIGHT NO LONGER BE COMPATIBLE WITH THE NEW ONE
There's namechanges etc.
If you want to keep your old config, I suggest you copy it to elsewhere, and then manually replace the desired messages.

Mostly made by https://github.com/tbm00 via Github PR!