support source mapping for component styles. add html-loader.

[asnowwolf]

feat add css-with-mapping-loader to enable source mapping for component style
feat: add html-loader
feat: inline small SVG files referenced by HTML/CSS as dataURLs

NOTICE: Currently, angular will lost source mapping of component style, see my another PR: angular/angular#14175 . To experiment, please manually patch it first.

[hansl]

This PR does not seem to have a focused fix or feature, fails all the tests in the list, and does not have an issue attached to it. I'm going to close this.

[asnowwolf]

The problems it solves are:

1. For the Component Styles file, you can not see the correct SourceMap information when debugging.
2. When packing all the image files are not given the correct "cache-busting hash"

Should I first commit the issues before submit PR?

[asnowwolf]

And also, a test fail is because:

error An unexpected error occurred: "https://registry.yarnpkg.com/requires-port/-/requires-port-1.0.0.tgz: Request failed "502 Bad Gateway"".

But I will remove all node_modules and re-run npm test on my mac.

[asnowwolf]

All unit testing is green, but finally, It's failed because:

2 excessive dependencies in package.json:
    css-with-mapping-loader
    html-loader

Does we don't allow to add new dependencies? or need approval first?

[asnowwolf]

e2e testing is ok now.

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