Refactored script editor to be extendable with other languages

[d.healey]

This sounds significant, tell me more...

[Christoph Hart]

It‘ll be used for SNEX and SOUL once it‘s ready.

[orange]

@Christoph-Hart I saw "experimental SOUL node" in the commits a couple of days ago. What is that?

[Christoph Hart]

I played around with SOUL which is a new language from the JUCE guys. It‘s supposed to be OpenGL for sound, but it‘ll take some time until it can be used in a production environment.