init: Add quasselcore reload via SIGHUP signal

Shane Synanrequested to merge
digitalcircuit-guest/quassel:ft-sighup-reload into master

In brief

  • Add support for reloading quasselcore via SIGHUP
    • On Quassel 0.13.0+, reloads SSL certificates and other cached info
    • Configuration file isn't re-read, but that isn't meant to hand edited

Faux-commit adopted from Ubuntu packaging.

Approval given from Michael Marley (mamarley on Freenode IRC/#quassel).

Edited by Shane Synan

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