A Shrektacular changelog for a spring release (annyversary of Shrek movies in May).

• Loading animation during playlist processing
• Added MPRIS integration
• Added ability to open multiple files at once from file browser
• Now possible to drag and drop files to open (video / audio / subtitle - detected automatically)
• Added keyboard shortcuts window + new shortcuts
• Reworked fullscreen video experience
• Added option to set fullscreen player UI opacity
• New right click menu option to play a track next
• Added option to clear cache
• New utility pane for managing multiple saved playlists (folder-based for now)
• Hardened flatpak permissions (no filesystem access at all!)
• Added animations to make changes in the UI more visually appealing / coherent
• Faster loading speed with artwork caching (noticable with larger playlists)
• Reduced flatpak installed size by around 50% (runtimes not included)
• Reworked and improved seeking and slider
• Changed the default icon for tracks without artwork
• Polished karaoke lyric display
• Lots of backend and frontend related fixes and improvements
• Restructured development environment and codebase
• Other minor UI and UX tweaks