Removed OpenGL dependency in HUD, merged in HUD from Soren Kuula and config changes from Michael Carpenter

and reuse it when loading or saving new log files

Removed a lot of verbose debug output, added connection indication to main menu bar to improve situational awareness of operator

Also reorganized the code to be more readable.

Fixed roll angle in Google earth, still not smooth. Fixed a number of threading issues. Fixed all custom widget related bugs. Improved MAVLink decoder. Reduced CPU usage substantially across all views