Threading fixes

Path through code allowed for xmlfile to be used when file was not
opened. Also changed qWarning->qDebug to allow QT_FAIL_WARNINGS to be
used to find bugs.

This allows us to run with QT_FAIL_WARNINGS to find bugs. Also temp
comment out of failed signal connection.

This prevents a threading problem where previously the new happened on
the wrong thread.

This way we can test with QT_FAIL_WARNINGS set.

Need to check for QImage failure otherwise it will through a qWarning.

mavlink: updated submode to latest master

New implementation of PX4 RC Calibration

Plus a few API tweaks

Mimic pending param support by just calling through to setParameter.

Fix Windows QUpgrade on TeamCity

UAS: disabled global position forwarding

FTP progress bar and download speed

Also updated to latest QGCUASFileManager implementation.

Also restructured signals to be more command-centric as opposed to
ui-centric.

Revert "Joystick: update gui and send new mavlink target messages". That PR broke Windows compilation and had other issues that also needed to be addressed.

Fix windows install

Joystick: update gui and send new mavlink target messages

Mavlink update

And I really mean it this time!