Changed the Main Activity Line Colour

- Changed the @color/line_ruler_colour value to #CCCCCC, so that it
blends more into the background.
Added New Icon

- Added the new Icons done by Chris.
Maybe fixed the Settings page.

- The settings page should now hopefully work.
Fixed Favourites Button

- Fixed Favourites Buttons for Compass and Camera.
Merge remote-tracking branch 'origin/master' into design