Accel calibration wizard fix

Hopefully fix thread safety issue in opmapcontrol

Operator = is not thread-safe, but copy constructor looks to be. This
is causing an intermittent crash.

Correctly initialize floats as NaNs where expected.

Fix DISABLE_GOOGLE_EARTH

Fix broken connect

Remove signal overrides

QGCFileDialog can now be handled by unit test code

Turn off Windows Error Reporting for unit tests

This keeps TeamCity from hanging on a dialog box

Remove unused code

This was leftover from a problem I was having with virtual slots

Simple MainWindow Unit Test

Splash screen is optional. Also remove some unused class definition.

New Unit Testing framework

Deployment target is still 10.6

Allows for UI unit tests to be written:
- Ability to respond to expected message boxes
- Ability to fail test if unexpected message boxes occurs

Remove unused code