Upgrade project to be compatible with Node 16.3.0

[dtinth]

• Upgraded Yarn: 1.17.3 → 1.22.10
• Upgraded Gulp: 3.9.1 → 4.0.2
  • Gulp 3 does not support Node 12
    Gulp 3 is broken on Node 12 gulpjs/gulp#2324
  • Gulp 3 is no longer supported, so forced to upgrade to Gulp 4
    Gulp 3 is broken on Node 12 gulpjs/gulp#2324 (comment)
  • Gulp 4 contains breaking changes in task definition
    https://stackoverflow.com/a/51999610/559913
  • Gulp 4 does not support forward task references (worked around using undertaker-forward-reference) to minimize code churn
    https://gulpjs.com/docs/en/api/series/#forward-references
• Upgrade webpack: 4.20.2 → 4.46.0
  • This solves a weird error, "Callback was already called"
    https://stackoverflow.com/a/67847070/559913
• Replaced node-sass (deprecated) with sass
  • Upgraded sass-loader: 7.1.0 → 10.2.0
    • sass-loader@11 not compatible with webpack@4 (requires webpack@5)
    • Options schema changed to be inside sassOptions

Changelog

Upgraded project dependencies so that it can be run on Node 16.3.0. This should make it easier for new developers to get started playing around with the codebase.

[sonarcloud]

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