Jack-select

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* Fixed: QjackCtl sometimes saves certain settings as quoted strings and
the QjackCtl.conf parsing of jack-select didn't handle that correctly,
* Fixed: newer versions of QjackCtl use `0` as the default value for several
settngs, but setting these settings actually to zero will prevent proper
JACK operation. For these setting a value of `0` is now interpreted as
meaning "(re-)set to default value".
* Updated copyright year in readme, man page and license.
* Added classifier for Python 3.10 support.
* Reformatted source code with black.

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* Gracefully handle when the JACK D-BUS service vanishes (e.g. caused by
running ``jack_control exit``) and re-connect on-demand.
* Updated copyright year in readme, man page and license.
* Removed Python 3.5 support, added 3.9.

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* Add sub-menu to systray menu to start and stop a2jmidid and control its
options and command line options for the latter as well.
* Add application settings loading/saving.
* Updated source code documentation, readme, man page and screenshots.
* Added ``build`` and (POSIX only) ``uninstall`` targets to Makefile (fixes 5).
* Removed Python 3.4 support, added 3.8.

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* Add missing images to source distribution.

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* Configuration file can be given via command line option (a5b9933).
* When a preset name is given on the command line (or the ``-d`` option is
used), activate the (default) preset also when jack-select was not already
running (439cdf5, 73bd6fe).
* Updated man page (a1c6596).
* Major internal code restructuring (0f27755).
* Map all JACK settings to a D-BUS type explicitly (8c158d89).
* Support 'slave-driver' engine parameter (this is not present in QjackCtl's
configuration file, though) (2601189).

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* Added support for missing JACK engine and driver parameters (a5705b8).
* Fixed and improved QjackCtl settings to JACK parameters mapping (878b8ca).
* Improved debug logging of setting changes when activating a preset
(c865bab, a5705b8).