Introduce MessagesLaneManager (#2227)
* some useful stuff like LanesManager * clippy * more clippy * Error::LanesManager * {in, out}bound_lane -> active_{in, out}bound_lane * merge two impl blocks in one * fmt
* some useful stuff like LanesManager * clippy * more clippy * Error::LanesManager * {in, out}bound_lane -> active_{in, out}bound_lane * merge two impl blocks in one * fmt