Refactoring and Google Map

- Refactored the file layout
- Included Google Maps
Changed design of buttons for detail and dialog screen

Buttons now stay on screen, even if the text fits not. The text could be
scrolled independent from buttons.
Add orientation to GPSListener

- Made the map rotating
- Added preferences for orientation
Redesign of ShowScreen and RemoveScreen

- Added OSM and OCM map tile layers