mavproxy: update to 1.3.6

Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>
mavlink: update to latest git

Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>
pymavlink: update to latest git

Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>
qgroundcontrol: rename recipe in preparation for QT5 port

QGC 2.1.x will be qt5 based.

Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>