Get the variable rather than indexing into the array each time
Simplify some expressions in sav7 for readability
Make SAV_EventFlags use comboitem explicitly by type rather than an anonymous type with same member names
Thanks MrPerson0 on discord for notifying us of this mechanic. Stadium 2 can utilize Gen1 learnset data while keeping them in PK2 format, retaining the met data.
held item list now allocates less (concat arrays instead of ienumerables)
item list already prunes out of range items, so simplify data source fetch
simplify item list prune (return as list, so we can call RemoveAll instead of Where.ToList)
