Added font size controls

Added basic method fro changing font size. Open the menu to increase or
decrease font size, a bit of a clunky user experience, you have to open
the menu several time if you want to up the font size by any decent
value. Also it currently doesn't work. I've populated the menu but the
buttons don't do anything, I even added a toast and it's not showing up.
The fontSize variable however is fine, I tested that works.