v0.23.1 fix desktop core

Apart from some crash and data loss fixes, this fixes the way Lisien instantiates ParquetDB, so that if you use the library on desktop, it will work with the version of ParquetDB that's been officially released. There were more API changes in the prerelease than I thought.

I improved the type safety while I was there, and implemented a new way of hashing the game code. This does nothing you'd see yet. At some point, it will help ensure that imported game state is for the game you're really running.