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Add support for geofence return point. Also fixed a bunch of bugs in geofence and rally point support.

Fix initialization

Pattern Preset support

Change-Id: I80acc497ef8fc574f64b181a8d276c5b00d4e057

Heading: Switch from Radians to Degrees

Work around quirkiness with ArduPilot and LOITER_* NaN handling on heading.

No camera commands for ArduPilot

Get rid of QGCView, QGCViewPanel and FactPanel. All messages and dialogs are now handled in the root window.

BUGFIX: When scanning from the top the starting altitude shall be equal to the structure altitude.

Hack around ArduPilot problems with unsupported NaN in Loiter commands

Structure Scan turns on Survey photo mode

Fix layer heights

More work on Structure Scan rewrite

Bug fixes for Structure Scan. Also includes support for Entrance/Exit Alt.

Add support for Start From Top/Bottom, plus more helpful stats

Use correct QT_TRANSLATE_NOOP to prevent crash

Default ROI altitude to 0

Show camera mode if plan contains it

Rework complex distance, camera shot count calc for better back compat

Save camera shots and complex distance in plan file so that values are valid when reloading

Should not rebuild transects for newer file formats where mission items are stored in file

Should not rebuild transects when loading. Mission items are already stored in file

Fix Survey additionalTimeDelay as it relates to hover and capture

Preserve clockwise winding when adjusting vertices

Add internal error case

Support for new AltitudeFactTextField

Make settingsGroup public for custom build overrides

Move valueSetIsDistance to Fact so custom builds can override

Default abort alt = 0. This works around problems between multi-rotor and fixed wing.

Radius to 1 decimalPlaces

Expose complex item names in a way useful for custom builds

Support custom build override of available complex items

Fix valueSetIsDistance when manual camera change