Add More Keybinds Accessible to Controller and Touch - BE

Add the ability for controller and phone players to bind different buttons to hotbar slots. Since square and triangle basically do the same thing as each other on default controls, it allows the player to quickly swap to a sword/elytra or any other useful slot without having to spam the bumpers. If you do it for controller, make it an optional keybind on mobile as well (for people who don't have the ability to quickly tap on far hotbar slots) so that you raise the overall mechanical accessibility for all devices on the Bedrock Edition. 

Also, a camera sensitivity bar that can go to 200%+ would be awesome for people playing on higher sensitivity controller wise.