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.

Update build requirements for Fedora.

Set new RC_CHAN_CNT param after cal

Text to Speech Tweaks

New, QML based Tool Bar.

Remove old battery estimation cruft