Theme additions & Option menu improvements

Improved themes:
- Flipclock (flips) colors matches theme backgrounds
- added "Blueprint Grungy" theme
- replaced "Gray Wash" theme completely with "Dark Linen" theme
- Navy Blue theme with new (selfmade) background tile
- Option menu is new arranged
- Option menu items are smaller
- Option menu background is now softed
- some themes are now connected with grayscale app icons
- fixed some margins in mail section