Added proper support for fullscreen mode, fixed issue with window state update on perspective change

Started parameter interface refactoring to adhere to MVC design pattern. Working on getting custom widgets completely up and running

Small usability fixes for the Google Earth view, is now more convenient to use. Editing now only possible in edit mode, prevents false edits

Improved Google Earth interface, clearing trails works, switching views works (but is not yet perfect), switching editing mode on/off works

removed unnecessary list element operations when updating waypoint list view. There is still some crazy updating going on - most probably in the wp widgets