Slowplay - A new tool inspired by playitslowly

Hello everyone,

after years of using playitslowly for my bass classes I was forced to quit it after updating my laptop OS to a new Mint version, so I decided to write something similar that could work on modern Linux box and here is what I came up with: [Slowplay](https://github.com/aFunkyBass/slowplay)

As you may notice it is HEAVILY inspired by playitslowly. I also copied small chunk of Jonas code into my software... ;) Comparing to playitslowly I stripped off the starting and ending point, and I completely reworked the keyboard shortcuts to fit my personal needs while teaching music.

Anyway, feel free to download it and try it. Keep in mind that it has just been released and it's still at early staging, but it might do the job.

Thank you @jwagner for your great work and inspiration.
Guido

The issue names no repository file, test, or entry point and instead points to the external Slowplay project. Review that linked project and the surrounding issue history first; a concrete change to playitslowly and a verifiable completion condition are still missing.

Written by the indexing model from the issue text.