Add String Input Fields with password/protected string support

[JustDerb]

I am the maintainer of the Vs Twitch mod and I recently just added a dependency to your wonderful mod to allow folks to change settings in game! One key field I've kept off the option menu is the Twitch OAuth2 Key since it's technically a secret value (we wouldn't want a streamer to accidently broadcast it).

I was wonder about if you had any thoughts on adding a new ConfigOption that stores "secrets" to this mod?

[Rune580]

that's pretty doable, I can look into it later in the week.