[FR] Reverb about boops

[sjaehn]

@unfa . I took a look into the MVerb source code. Fine. Or the Faust-created ArtyFx Roomy. Anyway TODO for version 1.4.0.

[sjaehn]

Changed to TODO for version 1.6.0

[sjaehn]

@unfa , now implemented in the 1.5 branch. I decided to take Ardour's Community Edition a-Reverb as this one is really fast. And seems to be less complicated and less artifacts producing than MVerb.

At this moment, I only exposed the room size parameter. But there are also other parameters like input gain and feedback that can additionally be exposed (not exposed in a-Reverb). The blend parameter, that is equivalent to mix is already controlled by the plugin engine.

And I keep my eyes open for a really glitchy extreme reverb. Maybe something like Infinity2 by Chris Johnson?

[sjaehn]

Airwindows Galactic reverb implemented in e54ad8b . Airwindows Infinity2 reverb implemented in 72d50fc . Now you can choose between three reverbs.