Use a dedicated signal handling thread on MT-enabled Tcl cores#10

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fredericbonnet wants to merge 2 commits intoflightaware:masterfrom

fredericbonnet:master

Commits on Mar 7, 2019

Use a dedicated signal handling thread on MT-enabled Tcl cores
fredericbonnet
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Commits on Apr 4, 2019

Don't restart signal thread when (un)blocking signals, catch all signals in the signal thread instead.
fredericbonnet
committed