Utility classes

[Penguin-Spy]

Implemented features:

• re-adding the aria-controls attribute to all TabBar components (allows for settings icons without :nth-child)
• an attribute for the current nitro theme: html[data-nitro-theme="MINT_APPLE"]
• data attributes for messages (author id, author is bot/webhook, author is self, etc.)
• adds a .replugged class to the html element for themes to detect which client they're on

[DracoClaw]

been using the message classes for a while now and it's good. only change i did was adding && !message.interaction to the is-webhook class to stop it marking command replies as webhooks