[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
[conf] altura
[start.py] Select when launching, start.py alias
[conf] flight arena