Importing save files

It doesn't happen much (at all?) these days, but more games should support importing the save file from an entirely different game.

Early on in Unangband's development history, I supported important vanilla Angband character saves: the game was initially - and arguably still is - an Angband + cool stuff variant. Since then, the two save file formats have undoubtedly diverged, but I'm still tempted to redo this functionality.

Here's a chart of some games which did support this functionality.