Clean Twitch Chat

Removes/allows toggling of UI elements around Twitch's chat

Removes UI elements blocking Twitch chat and adds a button that allows you to hide/show the chat message input. Keyboard shortcuts: Alt + Up Arrow - slides the chat message input up to become visible Alt + Down Arrow - slides the chat message input down to become hidden Ctrl + Up Arrow - slides the chat message input up, and also saves that setting to automatically show the message input when entering a stream Ctrl + Down Arrow - slides the chat message input down, and also saves that setting to automatically hide the message input when entering a stream Alt + M - slides the chat message input up if not visible and automatically focuses/activates the message input to allow for immediate typing