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

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

Currently testing parameter write, close to completely working, created beta release binary from this state