This is optional because I really don't know if I trust it. I don't see
much wrong with it (aside from the warning about not using it with auto-
resolve, because it won't restore lost aircraft), but it's really not
something I'd built for since it's not going to be possible as the RTS
features grow.
Fixes https://github.com/dcs-liberation/dcs_liberation/issues/2735.
This is by no means complete. The bugs that this solves were already in
6.x, but we'd hidden the speed controls for the sim in that release, and
have always said that anything done after pressing "go" the first time
is undefined behavior. This is the first step on making those mid-sim
actions behave correctly.
UI actions such as creating a new package need to be executed between
ticks of the sim. We can either do this synchronously by blocking the UI
until the tick is done executing, acquiring a lock on the sim, executing
the action, then releasing the lock; or asynchronously by queueing
events and letting the sim execute them when it completes the current
tick (or instantly if the sim is paused).
Anything that comes from the new UI (currently just the map) must be
asynchronous because it goes through the REST API, but for the old UI
it's simpler (and because the lock will only be acquired as quickly as
the user can act, shouldn't slow anything down) to do this
synchronously, since it's difficult to use coroutines in Qt.
https://github.com/dcs-liberation/dcs_liberation/issues/1680
Rather than polling at 60Hz (which may be faster than the tick rate,
wasting cycles; and also makes synchronization annoying), collect events
during the tick and emit them after (rate limited, pooling events until
it is time for another event to send).
This can be improved by paying attention to the aircraft update list,
which would allow us to avoid updating aircraft that don't have a status
change. To do that we need to be able to quickly lookup a FlightJs
matching a Flight through, and Flight isn't hashable.
We should also be removing dead events and de-duplicating. Currently
each flight has an update for every tick, but only the latest one
matters. Combat update events also don't matter if the same combat is
new in the update.
https://github.com/dcs-liberation/dcs_liberation/issues/1680
