Updates for using webpack 5. Please review

[petrushy]

A PR for building using webpack 5. It is working but please review, I am by no means an expert in this area.

Especially regarding the import of .css in the src/index.js I think is likely not the right way to do it, but cannot find another way without a protest regarding the exports in cesium:

import "../dist/Widgets/widgets.css"

[goldenram]

Any progress made on this? We are trying to update our project to use Webpack 5 and the Cesium library is the only library blocking completing that task. Thanks!

[petrushy]

Hi, It works it seems and I also realized there is another PR with webpack 5 #23

But would be good if someone with more insight reviewed this / that.

[boeckMt]

Hey I think there are now three PR's with similar stuff. Maybe someone can link/merge #28. #23, #25 together?

[maylortaylor]

I am getting a ReferenceError: __dirname is not defined in the index.cjs file at the point below:
module.exports = webpack_require("../../node_modules/cesium sync recursive")(path.join(
__dirname,
"Build/CesiumUnminified/index.cjs"
));

[jjspace]

replaced by #52