Add support for Ableton Link

[TimDaub]

https://github.com/Ableton/link

In some browsers, addons can create UDP sockets. There's some resources that have reversed the link protocol, so it shouldn't be too difficult to add a "Link" button to WASM synth: https://github.com/westhom/AbletonLinkProtocol

Another option could trying to include the link library directly in WASM somehow. But that'd only work for environments where UDP sockets are natively supported (not browsers)