Generator: Fix all but the first enum node having no type
Generator: Instead of returning "INVALID" for ORed flags, try to find the underlying values

For example,
> (EPersonaStateFlag_OnlineUsingWeb | EPersonaStateFlag_HasRichPresence).String()
now returns
> "EPersonaStateFlag_HasRichPresence | EPersonaStateFlag_OnlineUsingWeb"
Generator: Make StartsWith call locale-independent
Steamlang: Regenerate