[smuxi] (37 commits) ...Merge branch 'gnome/master'

[Mirco M. M. Bauer <mmmbauer src gnome org>]

Summary of changes:

  f1a2f06... ThreadPoolQueue: reduce lock{} time
  d9f183d... ThreadPoolQueue: refactoring, extract Dequeue() from CheckQ
  44ab327... configure.ac: should check for NUnit
  660515c... travis: use `set -e` as a workaround for travis not abortin
  6508f97... travis: install libnunit-cil-dev manually to fix build with
  a90a315... debian: remove unneeded libtool dependency
  e9951f5... Merge pull request #281 from knocte/fixCiBuildWithNewMono
  e571f0b... Merge branch 'stable'
  07fe4b6... Merge pull request #282 from knocte/removeLibtoolFromDebian
  e31c8d6... Add a macOS CI lane (GitHub Actions)
  c163d58... m4: removed unused macro
  8cb0a8b... CI: add some brew deps on macOS to make configure script ha
  c412057... Merge pull request #283 from knocte/dropUnusedM4
  63b2b83... CI: try to fix perl module XML::Parser missing hinted by co
  ea02c16... m4: allow pkg-config find mono in macOS
  bdbfb26... autotools: use log4net binary bundling if macOS (Darwin)
  60e478c... configure.ac: stop requiring NUnit to be present (useful fo
  8af03dc... autotools: use nini binary bundling too for macOS
  5ccacff... configure.ac: disable STFL frontend by default in macOS
  e7c9c4e... CI(macOS): just build in debug mode for now
  351a52b... Merge pull request #284 from knocte/addMacOsCi
  aa2e059... Makefile.am: fix `make run` in macOS
  3596731... GithubCI: remove confusing comment
  6309fae... Makefile.am: remove unneeded export in macOS
  b2ab9ae... Merge pull request #286 from knocte/fixMacOsMakeRun
  5590ba5... Merge pull request #255 from knocte/tpool_improvements
  d916faa... Debian: remove unused GNOME# from build deps
  6f508b3... Debian: build against DBus# 2.0 to fix build on Debian 10
  244d0a4... Debian: add NUnit to build deps to fix build on Mono 6
  dbe7e72... GitHub-CI: add IRC notifier
  ed9c7ce... GitHub-CI/notify-irc: use notice and shorter nick
  e73fcb2... GitHub-CI/notify-irc: truncate commit message
  f81632b... Travis-CI: fix build
  96351aa... Travis-CI: use notices
  b26af16... Travis-CI: drop legacy Mono versions
  06e0cfd... README.md, configure.ac: bump minimum Mono version to 4.6.2
  4ae2824... Merge branch 'gnome/master'