Changes

• Fix undo and redo stack not being cleared in the edit cheat dialog
• Add hotkeys to increase, decrease and mute the volume (see the new Audio tab in the Hotkeys tab of the settings dialog)
• Add support for drag and drop (the flatpak has it disabled due to due to Qt not supporting drag and drop in the file portal yet, see https://bugreports.qt.io/browse/QTBUG-91357)
• Add an implementation selection in RMG-Audio (see the advanced audio settings, the simple implementation might solve some audio issues for some people)
• Improve loading time duration of the ROM browser (the ROM browser should load faster when ROM entries are in the ROM browser cache)
• Improve control stick behavior in RMG-Input (thank you @kev4cards)
• Improve cheats and settings code in RMG-Core