* Update to Swift 5.0 and run `swiftformat`.
* Refactor `MediaKeyTap` start/restart.
* Remove useless comments.
* Reorder files.
* Add German translation.
* Switch to Carthage.
* Use `DDC.swift`.
* Add `NSScreen` extension.
* Simplify menu layout.
* Hide the display’s built-in OSD.
* Fix launch at login helper.
* Fix `quitClicked` connection.
* Refactor build phases.
* Use `os_log` instead of `print`.
* Use more specific check for `minReplyDelay`.
* Add whitelist.
PR #59 with enhancements and fixes (Changes done by @JoniVR):
- 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 (#48, #15)
- **Fixed app unresponsiveness and high CPU on launch** (might be related to #50, #37, please do keep in mind that on initial launch there will still be a little unresponsiveness because the underlying framework - called [ddcctl](https://github.com/kfix/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.
