(server) Keep the server responsive when it falls behind sending unit updates
(server) Fix approach requests ignored after a controller disconnects
(server) Fix tracking state kept for units that left the mission
(server) Fix radar range resolution mixing up coalitions
(server) Fix remaining lags when units are created or destroyed while controllers are connected
(server) Fix a possible crash when units are destroyed while controllers are connected
(server) A contact lost then detected again stays on the RWR and keeps its real coalition
(server) Fix a possible crash when a unit is updated and removed in the same tick
(server+client) Fix steady memory growth of the server while a mission runs
(server+generator) Fix memory growth and duplicated updates on units