Add SIGINT handler?

[adigitoleo]

Thanks for the package, I'll need to read through more to understand it all.

One idea is that it could be convenient to handle SIGINT. Currently we have to press ^C twice to kill the server and it's a bit noisy:

%zsh: jl --startup-file=no -e 'using DaemonMode; serve()'
^CUnhandled Task ERROR: InterruptException:
Stacktrace:
 [1] poptask(W::Base.InvasiveLinkedListSynchronized{Task})
   @ Base ./task.jl:827
 [2] wait()
   @ Base ./task.jl:836
 [3] wait(c::Base.GenericCondition{ReentrantLock})
   @ Base ./condition.jl:123
 [4] #134
   @ /usr/share/julia/stdlib/v1.7/Distributed/src/remotecall.jl:281 [inlined]
 [5] lock(f::Distributed.var"#134#136", l::ReentrantLock)
   @ Base ./lock.jl:190
 [6] lock
   @ ./condition.jl:78 [inlined]
 [7] macro expansion
   @ /usr/share/julia/stdlib/v1.7/Distributed/src/remotecall.jl:279 [inlined]
 [8] (::Distributed.var"#133#135")()
   @ Distributed ./threadingconstructs.jl:178
^Cfatal: error thrown and no exception handler available.
InterruptException()
jl_mutex_unlock at /buildworker/worker/package_linux64/build/src/julia_locks.h:129 [inlined]
jl_task_get_next at /buildworker/worker/package_linux64/build/src/partr.c:484
poptask at ./task.jl:827
wait at ./task.jl:836
task_done_hook at ./task.jl:544
_jl_invoke at /buildworker/worker/package_linux64/build/src/gf.c:2247 [inlined]
jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:2429
jl_apply at /buildworker/worker/package_linux64/build/src/julia.h:1788 [inlined]
jl_finish_task at /buildworker/worker/package_linux64/build/src/task.c:218
start_task at /buildworker/worker/package_linux64/build/src/task.c:888

[adigitoleo]

Oops it's a duplicate of #41