Register custom scheme?

[atypicalprogrammer]

Is it possible to register a custom URL scheme so that when I navigate to "sample://test" in Safari, it will open my app?

[develar]

Please see #397 (comment)

As part of this issue I am going to simplify it.

[develar]

Relates #284

[develar]

5.34: https://github.com/electron-userland/electron-builder/wiki/Options#BuildMetadata-protocols