Add large screen support

[fluffy88]

Users with large screens (10" tablets & TVs) would benefit from having the ability to scale the entire app to a larger size to make viewing text from a distance easier.

This is a requested feature. http://www.boards.ie/vbulletin/showthread.php?p=90958759#post90958759

Possibly allow enabling or disabling of large screen support in a settings page.

[fluffy88]

Referenced commits
6921f0c Prepare layouts to support text scaling via styles
7d2acfa New styles for larger text on large screens
4a5fdb0 Moving big screen styles to correct folder
d8acd38 Fix height issue with TwoWayView
0e54841 Begin support for multiple themes