Cleaned up communication structure significantly, should now be easier to add new links. Signal bytesReceived(link, QByteArray) is now only way to pass on newly received data

Added MAVLinkLight as an example how to add new protocols, it is currently not an actual implemented protocol

fixed mutex usage in getTotalUpstream and getTotalDownstream and added initialization to connectionStartTime
(cherry picked from commit 15161eec)

fixed mutex usage in getTotalUpstream and getTotalDownstream and added initialization to connectionStartTime

Made generator --pedantic GCC flag compatible/C89 compatible, fixed a bug where heartbeats where only sent to first link

Started to add support for autopilot firmware updates, added Linux compile instructions, fixed date in mavlink.h to english independent of OS language settings

Fixed object instantiation bug, started to implement QGroundControl-Server for online MAV visualization and control

Added support for MAVLink XML inclusion, added support for multiple Autopilots, improved protocol generation