Mnemosyne 2.4 released

-Upgraded all code to Python3 and PyQt5, so that Mnemosyne no longer
depends on libraries which are gradually becoming unsupported.
-The move to PyQt5 enabled to show progress bars with percentages for
certain long operations like initial sync.
-Improved startup speed.
-New command line option "--high-dpi-scaling" to enable scaling for displays
with high DPI values. Not enabled by default because it can cause some
issues with multiple connected displays.
-Tag combobox now expands to give suggestions for tags also when using more
than one tag (patch by Emilian Mihalache)

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