[tmtc] fix rx_lost_time in link

still has some weird delay of ~2s until it starts counting rx_lost_time up..
[server] write paparzzi_version as comment at beginning of log
[airborne] add pprz_version and send it with BOOT
add get_pprz_git_version and use in mavlink custom_version
[ground_segment] fix green->darkgreen change

Since tcl8.6 "green" refers to same color as "darkgreen" (to the one used in web) and the former "green" is now "lime"...
But "lime" is not available in older versions, so hardcode the color to #00ff00