V 0.3.0

* A lot of little fixes to prevent crashes and glitches due to multithreading
* Take special care of the +-180 degree problem
* Add RGB support to raster maps
* Add a lot of cursor stuff to select items and to display on-screen-options
* Add timezone support
* Add dialog to view/edit waypoint data
* Add 'moving waypoint' and 'project waypoint' as functions to on-screen-options