Twitch username display in BS+ Chat now shows display names with usernames

[mercurialworld]

trafficstars

See: https://discord.com/channels/723117082111246416/1355978731600216378/1355978731600216378

Modifies the Twitch username display in chat so that by default, if a user has a display name that differs, case insensitive, from their login name/username (localized/international names for example), it'll show both the names, like on Twitch itself.

Also adds an option to not display international names entirely, only showing the login name. I personally didn't think this belonged with the rest of the options, so I added a "Twitch" tab.

Had to also add commit 851861bb0f6e424b842f5eb90f5c32e386b5dc56 in order to get the mod to build in the first place, the commit does not need to be applied if you don't want to do so.

~~I have no idea what I'm doing, I've never modded Beat Saber before.~~

[hardcpp]

Thanks will take a look verys soon