Added angle conversion testing, added battery settings option, added option to set MAVLink ID of groundstation

Added right-click option to select MAV, ensured that waypoints get updated properly on switching MAV

Added not yet working version of logging / log replay, fixed ALL bugs in main window, enabled full persistence in main window and serial link.

Substantially bugfixed and improved deactivation/activation and persistence of widgets. A lot of testing of Google Earth view, only minor improvements

Fixed initial startup bugs, cleaned up the activation-deactivation of update timers. Added initial instructions for new users.

Significantly bugfixed persistence and link adding/removal. Not yet fully there, but getting closer to release

Ardupilot support, builds now cleanly on Windows. Fixed a bug where the application could crash if no system was connected.