Migrate to webpack 5

[jmorag]

I've been playing around with building this as an esm module and a necessary prerequisite is to upgrade to webpack 5 which supports that. Haven't gotten the esm stuff working yet, but this is nice to have on its own.

[sschmidTU]

Nice! We'll test this.
What does stream: false do? (in resolve.fallback)

I hope we don't run into compatibility problems like this one:
diegomura/react-pdf#1029

[jmorag]

Without it we get this:

ERROR in ./node_modules/jszip/lib/readable-stream-browser.js 9:0-34
Module not found: Error: Can't resolve 'stream' in '/home/joseph/Projects/opensheetmusicdisplay/node_modules/jszip/lib'

BREAKING CHANGE: webpack < 5 used to include polyfills for node.js core modules by default.
This is no longer the case. Verify if you need this module and configure a polyfill for it.

If you want to include a polyfill, you need to:
	- add a fallback 'resolve.fallback: { "stream": require.resolve("stream-browserify") }'
	- install 'stream-browserify'
If you don't want to include a polyfill, you can use an empty module like this:
	resolve.fallback: { "stream": false }
resolve 'stream' in '/home/joseph/Projects/opensheetmusicdisplay/node_modules/jszip/lib'
  Parsed request is a module
  using description file: /home/joseph/Projects/opensheetmusicdisplay/node_modules/jszip/package.json (relative path: ./lib)
    resolve as module
      /home/joseph/Projects/opensheetmusicdisplay/node_modules/jszip/lib/node_modules doesn't exist or is not a directory
      /home/joseph/Projects/opensheetmusicdisplay/node_modules/jszip/node_modules doesn't exist or is not a directory
      /home/joseph/Projects/opensheetmusicdisplay/node_modules/node_modules doesn't exist or is not a directory
      looking for modules in /home/joseph/Projects/opensheetmusicdisplay/node_modules
        single file module
          using description file: /home/joseph/Projects/opensheetmusicdisplay/package.json (relative path: ./node_modules/stream)
            no extension
              Field 'browser' doesn't contain a valid alias configuration
              /home/joseph/Projects/opensheetmusicdisplay/node_modules/stream doesn't exist
            .ts
              Field 'browser' doesn't contain a valid alias configuration
              /home/joseph/Projects/opensheetmusicdisplay/node_modules/stream.ts doesn't exist
            .tsx
              Field 'browser' doesn't contain a valid alias configuration
              /home/joseph/Projects/opensheetmusicdisplay/node_modules/stream.tsx doesn't exist
            .js
              Field 'browser' doesn't contain a valid alias configuration
              /home/joseph/Projects/opensheetmusicdisplay/node_modules/stream.js doesn't exist
        /home/joseph/Projects/opensheetmusicdisplay/node_modules/stream doesn't exist
      /home/joseph/Projects/node_modules doesn't exist or is not a directory
      /home/joseph/node_modules doesn't exist or is not a directory
      /home/node_modules doesn't exist or is not a directory
      /node_modules doesn't exist or is not a directory
 @ ./node_modules/jszip/lib/support.js 35:27-62
 @ ./node_modules/jszip/lib/index.js 40:16-36
 @ ./src/Common/FileIO/Mxl.ts 8:32-48
 @ ./src/OpenSheetMusicDisplay/OpenSheetMusicDisplay.ts 16:14-45
 @ ./demo/index.js 1:0-91 431:36-57 514:44-65

We probably actually want the polyfill instead of just disabling it. I'll add that.

[sschmidTU]

Already migrated in #1105.