BackgroundMusic Versions Save

⚠️There's a bug in this release due to code signing: https://github.com/kyleneideck/BackgroundMusic/issues/233. Get v0.3.1 instead: https://github.com/kyleneideck/BackgroundMusic/releases/tag/v0.3.1

Changes since v0.2.0:

• Change output device in some cases when devices are added/removed.
• Update the preferred devices list when the user changes output device.
• Fix errors logged when the current output device is disconnected.
• Store the preferred devices list in User Defaults.
• Move the output device menu items to the main menu.
• Fix build_and_install.sh failing when run from a path containing spaces.
• Add an option to use a volume icon instead of the Background Music logo.
• Fix a crash when BGMDevice's volume is changed.
• Fix potential minor memory leaks in BGMPreferredOutputDevices.
• Fix another crash when BGMDevice's volume is changed.
• Add music player: Google Play Music Desktop Player.
• Add music player: Music. (Apple renamed iTunes to "Music" in macOS Catalina.)
• Update copyright years.
• Enable Hardened Runtime in BGMApp, BGMXPCHelper and BGMDriver.