☂️ Improve WebPack Support

[Danielku15]

Background
Supporting alphaTab in environments where it is bundled together with other libraries always has been a bit of a pain as alphaTab spawns WebWorkers and AudioWorklets using the script file it is contained in.

But bundlers like WebPack reorganize the code quite significantly and also often come with an own dependency management system which replaces the default import/script include system from browsers.

Related issues to bundling

• Web Workers can't be initialized with NodeJs #662
• alphaTab can't work with vue3 #699
• Use with Node.js #541
• Minimization #116

Goal of this issue
The goal of this issue to add official support for WebPack 5 (WebPack 4 is considered out of scope). There have been already discussions ongoing how this can be solved and improved with WebPack.

• Improve WebWorker handling so that it works together with WebPack 5 when served locally together with the application itself.
  State: Solution identified and improvements in progress
  Related discussion: How to integrate own library with WebPack which needs to span WebWorkers and AudioWorklets webpack/webpack#15382
• Improve WebWorker handling so that it works together with WebPack 5 when served through a CDN where origins can differ.
  State: Discussing built-in inline worker support in WebPack, evaluating custom plugin as intermediate solution.
  Related discussion: Inline worker in webpack 5 webpack/webpack#14066
• Add support for AudioWorklets with WebPack 5
  State: Discussing built-in AudioWorklet support in WebPack, evaluating custom plugin as intermediate solution.
  Related discussion: support worklet webpack/webpack#11543
• Prepare example at https://github.com/CoderLine/alphaTabSamplesWeb for plain webpack usage.
• Prepare example at https://github.com/CoderLine/alphaTabSamplesWeb for usage in Vue.js.
• Prepare example at https://github.com/CoderLine/alphaTabSamplesWeb for usage in Angular.
• Prepare example at https://github.com/CoderLine/alphaTabSamplesWeb for usage in React.