mixxx: 2.2.4 -> 2.3.0
mixxx: 2.2.4 -> 2.3.0

* version update
* replace scons with cmake
* add new dependencies:
  - hidapi, lame, libebur128, libkeyfinder, libmodplug, libsecret,
    qtkeychain, serd, sord, soundtouch, sratom, wavpack
* use latest libshout again - streaming issues have been fixed

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