Creating GuidanceModule together with PositionDesired UAVObject (as discussed),
so dschin and me can work on it :-)
Will compile and (on sim_posix) execute, but PID logic is yet untested and preliminary.
git-svn-id: svn://svn.openpilot.org/OpenPilot/trunk@1722 ebee16cc-31ac-478f-84a7-5cbb03baadba
