Strip off file size from file name
More FTP support plus unit testing

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
Fix Linux Release compiler warning
Fix Linux Release build compiler warning
Merge pull request #812 from DonLakeFlyer/FTP

More FTP support, plus unit tests
Fix windows install

Copy platforms plugins to install
Windows install fix

And I really mean it this time!
Merge pull request #811 from mavlink/mavlink_update

Mavlink update
Merge pull request #813 from mavlink/joystickinput_settargets

Joystick: update gui and send new mavlink target messages
Merge pull request #814 from DonLakeFlyer/WindowsInstall

Fix windows install
Revert "Joystick: update gui and send new mavlink target messages"
Merge pull request #817 from mavlink/revert-813-joystickinput_settargets

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.