Changes since 1.7.5:
* using system scroll settings for playlists;
* using stable order for keys in the playlists.txt file;
* added support for float PCM format in the dsound and wasapi plugins;
* fixed seeking from command-line;
* fixed support for special keys in the shortcut editor dialog;
* fixed track index calculation;
* fixed possible crash in the library plugin;
* fixed compatibility with Qt 5.12;
* fixed Chinese Traditional translation.
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