Audio Settings Logic Rewrite

Changed the way one opens the audio settings: You can now do it on any
page, just by clicking the "volume" button at the upper left corner of
the screen. There's also some muting buttons, and I attempted to fix
some button text alignment issues in Chrome.
Keep in mind: In order to have this option, you MUST start at Main.html.
That's where all the audio controls are now. I did this so I wouldn't
have to use setInterval for another function or anything like that.