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!

Copy platforms plugins to install

More FTP support, plus unit tests

Added:
- sequence numbers
- better filtering for image encapsulated data messages versus FTP
- directory list now contains file sizes
- open command now returns file size in data