This commit also removes the `await` from every stream creation. The eviction will be handled totally assyncronously. The only drawback is the possibility of exceeding the cache limit for a moment, until the next execution of `evictOldest`.
This will only be a problem if the cache is set too close to the remaining disk space, which I wouldn't recomend.
I also removed the recursion.
Also: removes the -re ffmpeg option.
If this option is passed, ffmpeg won't write to fs-capacitor (and the cache file) as fast as possible.
In other words, the cache file won't finish writing until the entire stream has been played.
