Project-scoped Chat Validation

[dhowe]

[Submitted by @jceipak]

Tool to enumerate all unique chat IDs and ensure that all references to chats/lables are valid and that we don’t have any dangling chats that are neither referenced within the source text nor in the game code.

Any additional graph analysis for the chats, including cycle detection, etc…

DH: Here we can also do such things outputting the set of unique graphemes for a particular group of chats