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Merge pull request #31 from ben-xo/feature/document-prompt-mode

Feature/document prompt mode

Merge branch 'feature/add-discord-support'

Merge branch 'feature/better-web-for-obs'

Merge branch 'feature/runtime-prompt'

Merge branch 'feature/getter-setter-refactor-for-more-info'

v0.24

The following features are implemented in this merge:

* JSONServerPOC has been made into a proper default plugin (-J <port>) so that you can query the current playing track and all its details from, e.g. OBS or Twitch. Inspired by https://www.reddit.com/r/DJs/comments/gl4vfm/serato_now_playing/
* All data structures now use a generic GetterSetter base class which means that fields decoded are automatically always available. (Therefore, the JsonServer plugin has more info).
* Unknown fields (that I've encountered) are also available in this info by default.
* Field 39 has been determined to mean "played with the preview player" (i.e. with no hardware attached)
* Field 70 has been determined to mean that the info is an update to previously registered info. This seems to happen mostly on eject, so I've named the field eject - but this may change if I can find a more accurate description (see https://gitlab.com/eladmaz/SSL-API/-/issues/4)

Bump version to 0.23

PHP 7.4 fix

version bump in README

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