QGCComboBox with new simulateUserSetCurrentIndex

This allows unit tests to simulate user selections in a combo box
Renamed due to collision with new QGCComboBox
More implementation of Mock
Example file for QLoggingCategory use

Place this file in the location specified here:
http://qt-project.org/doc/qt-5/qloggingcategory.html
FlightModeConfig plus unit test
Mock param mgr is created with full set of params
Must new MockUAS otherwise qt resource system is not ready
VehicleSetup assures active as and parameters ready
Clear all maps in-between each test
Merge pull request #1075 from DonLakeFlyer/FlightModeSetup

Flight mode setup