Add a screen to toggle onscreen touch control visibility.

This sister-screen to TouchControlLayoutScreen will allow the user to toggle every single onscreen touch control's visibility except for platforms that support the pause/menu button: that's the only button that cannot be disabled(for safety reasons). It can even be toggled in-game.

Preview(heavily influenced by the Log Channel screen as you can see):
![Screenshot 01](http://i.minus.com/iYJTpNKiBBoSU.jpg)