Changes since 1.7.6:
* added KWin rules for KDE6;
* added display of volume when adjusting it with the mouse wheel in the skinned user interface;
* fixed support for multi-line comments when saving and restoring a playlist;
* fixed volume adjustment step when using mouse wheel;
* fixed some clazy analyzer warnings;
* fixed frequencies of the all spectrum analyzers;
* fixed handling of the file open errors.
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