[ocaml] filter for 'field' tag when looking at messages
[python] fix settings path
[messages] update dtd to allow descriptions

backport only dtd changes from #987
[ext] update chibios repo

since https://github.com/ChibiOS/ChibiOS-RT.git was deleted
[conf] Lodewijk
[select_conf] Now also selects control_panel
[conf] Bart
superbitrf session working
self landing with lower speed engine not turend off