Hi @the0neyouseek ,

As promised, my PR with enhancements and fixes for MonitorControl.

Here are the main changes

• Code migration to Swift 4.2
• Fixed the MonitorControl scheme which was gone for me
• Updated the screenshots and readme
• Added a feature that detects the default sound output device and only intercepts when an external display is set as default output, so Airpods, internal macbook volume and other non-monitor devices will be ignored (Listening for volume doesn't work with non monitor output #48, Audio source change #15)
• Fixed app unresponsiveness and high CPU on launch (might be related to Mouse cursor stutters as soon as the app is launched #50, High CPU usage. #37, please do keep in mind that on initial launch there will still be a little unresponsiveness because the underlying framework - called ddcctl - attempts to read your volume settings 10 times)
• Added a version and build number to the main preferences panel:
  
• Added a build script that increases the build number on each run. Version number still needs to be set manually.
• refactored some parts of the code to make it a bit more readable.

Some things to note

• I can't test multiple monitors as I only have a single external monitor.
• Please test my changes and let me know if I broke something.
• If you don't agree with something I did, or think there is a better solution, please let me know.
• Please don't forget to increase the version number inside Xcode when you release, otherwise there will be confusion with which version people are using (for example when they open an issue).

Best regards
Joni