WIP keep mill server alive if you Ctrl-C during --watch #339
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Fixes #327
This introduces a new
idleflag next todoneinsideMillServerMain#handleRun, which is temporarily set totrueduring the--watchphase.interruptServeris then skipped if theMillServerActionRunnerthread is idle, letting the normalt.interrupt/t.stopcalls interrupt & clean it up.This also makes the Mill server ignore SIGINT, since otherwise Ctrl-C on the Mill client will propagate through the parent-child process relationship and kill the server too.
On the side, this also cleans up the Mill Client's Java code to use try-with-resources to ensure resources get properly cleaned up, and names the various threads we spawn & main methods we use for better debuggability.