Remove PIXHAWK specific board support

This is the Pixhawk research board, not the PX4 production board.
Support for new parametersReady method

This allows you to determine if full parameter list is ready if you
missed the parameterListUpToDate signal.
Add support for filter list

This allows you to filter the list of parameters the widget displays.
Reorder top level buttons, new VehicleSetup code
Call AutoPilotPlugin instead of hard-wired code
New AutoPilotPlugin and VehicleSetup
Fix compiler warning bugs
Remove numbers from buttons
Support for new parametersReady method

This allows you to determine if full parameter list is ready if you
missed the parameterListUpToDate signal.
Add support for filter list

This allows you to filter the list of parameters the widget displays.
Reorder top level buttons, new VehicleSetup code
Call AutoPilotPlugin instead of hard-wired code
New AutoPilotPlugin and VehicleSetup
Fix compiler warning bugs
Remove numbers from buttons
Rebase to master
Merge pull request #983 from DonLakeFlyer/AutoPilotPlugin

Auto pilot plugin architecture
Fix light style for vehicle setup buttons
Set correct roles on actions

This way OS X correctly positioned menu items
Remove unused action