Acid Ape Chess

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- In two-player games, it is now possible to use the DGT3000 as time source (by selecting an option other than 25). Depending on your physical board model, this may reduce and/or mask clock lag, improving the players experience (particularly in blitz games).
- The PGN parser has been made more tolerant: PGN headers are no longer required for the first game (for instance, `1. e4' is now considered valid PGN data).
- Arasan has been updated to 23.4.
- Miscellaneous fixes and improvements.