Improve VST2 implementation

[ArborealAudio]

Good old VST2 will never die--I insist.

Let's ensure that's the case by providing a good VST2 implementation in Arbor that will sail the high seas of the future.

We need to address these issues to do so:

• [ ] #6
• [x] #5
• [ ] #9
• [ ] #10
• [ ] #11