[mcu_periph] sys_time: get_sys_time_msec and cleanup
[omap] Fix GPIO warnings
[vff] Disable debugging by default
[gps] Add a new GPS based on the datalink
[ground_segment] Add Optitrack to Ivy service
[gps] GPS datalink update to newest master.
[ins] Added the possibility to use GPS for altitude estimation
[optitrack] INS and AHRS improvements
[fms_network] Added multicast and updated optitrack speed differentation
[ardrone] Updated gains for inside
[optitrack] Renamed to NatNet and added more options
[gps] Added doxygen documentation to the GPS datalink subsystem