Convolver for DRC

[agent_kith]

It turns out to be relatively easy to get convolution going with Minimserver. Steps:

• Enable Minimserver in Snakeoil
  
• Update ffmpeg to version 4.1 under the hood
  
• On laptop, install Minimwatch, which monitors Minimserver instances
  
• Using Minimwatch, install Minimstreamer (Packages tab)
  
• Using Minimwatch, in System tab, follow Convolution instructions  to set up
  

Nice work! Apologies as I've been really slack on this (one man show makes it hard to balance everything).

I'll try and automate this in U5.

Think it's about time to revamp how the players are started, use checkboxes instead of radio buttons will allow you pick and choose exactly what you want to start.