Experimental support for Unity native audio plugins on the develop branch

Both @mtytel and I have posted on the Unity forum about this in the past. Our concerns seemed to have fallen on deaf ears. I’ve taken a big step back from Unity as a result. I have to say however, that I haven’t looked into this area in quite some time, but if @ed95 also reports issues with automation on custom GUIs then it looks like the problem is still there. Might be nice if ROLI reached out to them. It would be to Unity’s advantage. Heck, why not turn the screw a little and release a UE4 plugin that does allows automation. Apropos, their audio API has got a lot better in recent releases. I imagine supporting JUCE plugins there may be not be that tricky.