Adding: Random volume / Frequency / custom sounds / local install

[Woisek]

moodist is a really good alternative to Atmosphere Deluxe 7, but I think there is something, that would make it equal or even better: random volume changes with frequency.
It should work like this:
The set volume should randomly alternate within a set % range i.e. 5% (maybe defined in settings)
A frequency slider underneath defines how often this sound occurs, i.e. makes a wind come up loud, but dims away again.

The possibility to add custom sounds would be fantastic. A drag'n'drop field in each category to add a custom sound.

And finally, an easy way to set up moodist locally. On our own web server. 👍

[Nelinski]

FYI you can already set this up via to run locally. I've got it running locally with docker.