For roamers, go back to Lake Valor/Fullmoon Island, and re-interact with Mesprit/Cresselia so that the game can generate a new one.
Also add Rotom rebattle event flag, and fix consistency with flag labels.
Also removes sysflag 1294; the game has a flag reserved for a third captured species in the Soul Room after Latias and Latios but it's never set in scripts... third Lati DLC confirmed??????
These aren't referenced for the spiritomb encounter; according to the scripts, there's a hardcoded function which reads a byte[] and counts the number of nonzero entries.
The UgSaveData structure stores `byte[] TalkedNPCsID`, as described above.
Big thanks to @SciresM @sora10pls @Lusamine @architdate @ReignOfComputer for testing and contributing code / test cases. Can't add co-authors from the PR menu :(
Builds will fail because azure pipelines not yet updated with net6.
