Cross-browser testing

[MaxLaumeister]

This includes Safari and Safari iOS. BrowserStack could be a good resource.

NOTE OfflineAudioContext has the same restrictions as the AudioContext in that on certain platforms (like iOS) it must be invoked by an explicit user action like a click or tap.

https://tonejs.github.io/docs/13.8.25/Tone#offline-static

This task should be done as the LAST TASK before the 1.0 release