small cleanups in signal handling and worker init

Since signals and signal handlers are process-wide, just make
SIG_QUEUE a global constant since there's absolutely no reason
it should be otherwise...

Restore default signal handlers when building app in case our
app does anything strange or gets hung, it's nice to know
SIG{INT,TERM} can be used to kill it while it's loading.
Additionally, there's little point in clearing arrays before
nilling them: just trust the GC to do its job properly.

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