New Flight Mode config

Tool bar tweaks

Tool bar buttons now use QGCButton as base to inherit hover mode fix.
Made QGCButton.showHightLight into a public property so I could use it as a trigger for repainting the chevron button.

Fix hover state of Button

Also realized I don’t need __lastMouseXY

Chevron buttons in Main Tool Bar

Reduced size of the main tool bar buttons accordingly.
Connect/Disconnect buttons (and link configuration combobox) now use the default height.

Fix parameter config sizing

Use FactBinder to access facts from Qml

Passing parameters QVariantMap across C++ boundary was causing crashes
in Qt due to Qml array bugs. Referencing same Fact* across Qml boundary
in multiple QQuickWidgets caused jScript GC to crash.

Switch QGC firmware upgrader for PX4 to AWS and Travis. Use beta/stable/...

Switch QGC firmware upgrader for PX4 to AWS and Travis. Use beta/stable/master for Firmware, map all three items to master for Flow (because there are not beta/stable branches)

Minor fix to "Connect" button

Remove unused code

Button too small for when it switches to disconnect (multiple links adds a drop down icon to the button).

Completed Tool Bar settings in Preferences Dialog

Text to speech tweaks

Fix OS X Installer yet again

Unit Test fixes

Will rewrite singleton shutdown in separate pull

Also turn them back on

Although this should theoretically be a no-op it causes a crash in
Windows when running unit tests. Also parent toolbar in constructor.

Tool Bar Tweaks

These tests that make direct calls into the tool bar need to be updated.