Bitwig controller api externs for haxe.

NOTE: this is experimental and definitely doesn't work right now. The main thing lacking is the ability to have access to the java externs while targetting javascript. At the very least, we'll probably need to manually make the externs because --macro allowPackage("java") doesn't actually work :(

The code here is generated periodically from updates to controller scripts. Done thusly:

haxe generator.hxml -python bin/generator.py
python3 bin/generator.py "/Applications/Bitwig Studio.app/Contents/Resources/Documentation/control-surface/api"

Unlicense. See LICENSE. You shouldn't have to worry about any licensing restrictions other than those imposed by Bitwig. These are simply externs to let you use haxe to make your controller scripts.