- Drop unnecessary python3-magic dependency

* Support for GTK style manager (thanks A6GibKm)
* Use natural sorting for chapter titles
* Redesigned preference window
* Preferences can now be searched
* Fix: position slider did not update the time correctly after an import scan
* Fix: after an import scan the library did not display the currently playing book correctly
* Multiple small bug fixes
* Fix: in version 1.1.1 the mobile library switcher was not displayed when Cozy started with a narrow window
* Display an error banner if an error occurs while importing new files
* The audiobook directory selector in the empty state has been replaced by a button to allow a narrow window even with long directory names
* Fix: multiple small UI issues
* Fix: the welcome screen now works properly on a mobile device
* Fix: don't display the mobile library switcher when no files are imported
* Fix: in the book detail view the pause icon for a chapter remained even when the next chapter already started playing
* Display an error banner if an error occurs while importing new files
* The audiobook directory selector in the empty state has been replaced by a button to allow a narrow window even with long directory names
* Fix: multiple small UI issues
* Fix: the welcome screen now works properly on a mobile device
* Fix: don't display the mobile library switcher when no files are imported
* Fix: in the book detail view the pause icon for a chapter remained even when the next chapter already started playing
* Redesigned library
* Redesigned start screen
* Redesigned book detail screen
* Responsive design for the main window
* Introducing a welcome screen for new installations
* Fix: a rare bug where Cozy's volume was muted at first start
* Fix: long book names or author names will be truncated properly
* Chapters in the book detail view will now be loaded lazily (thanks chris-kobrzak!)