Update for Qt 5.11

New Create Plan support

Corridor edit toolbar

New addObject method

New reusable file dialog for KML/SHP loading

New features:
* Less padding to the right of drop indicator
* Ability to set font
* alternateText - Set alternate text for button display
* sizeToContents - Width will adjust to fit all contents

Fix toolbar button sizing

Fix textRole usage for QGCComboBox

Save/load main window state

Add degrees/radians conversion

Rework presets

Use TabBar in Complex Item UI

More work on mission item indicators

Fix dropdown indicator color

New QGCOptionsComboBox control

Allow split of current segment

Correctly handle command changes from no-coordinate item to coordinate item

Update/add support for external resetModel usage

Directions arrows in Fly View

Hide waypoint indicators unless they are really needed

FW Landing slope heights display

New QGCDynamicObjectManager support

Hide sequence numbers

New MapLineArrow control

New base class control for Survey/Corridor

Android builds add 32/64 bit text to version string

Toggle Rally Point insertion on/off.
Highlight current Rally Point and current Waypoint.
Use tab bar instead of a row of radio buttons for selection (Mission, Fence, Rally).
Fix QGCHoverButton to handle proper checked state toggle.
Get rid of the many arrays used to define behaviors for the ToolStrip. They are now all defined within its model.
Fixed color for disabled text within ToolStrip (it was invisible)

Support replay speed changing

Fix bug where QGCComboBox { model: ListModel would not work correctly

Add collision avoidance settings to Safety Panel

Update to the QGCComboBox to use a textRole in the case where it's availble.

Some small theme colour fixes.

Updating the items to be inline with the theme.

This is a small experiment into creating a custom theme for QGC.