fix(webpack): correctly load component stylesheets

[clydin]

Component styles were being generated as javascript due to the chaining of css-loader and raw-loader. This is changed to only use the css-loader for global stylesheets (the behavior before PR #3402).

If there is a desire/need to maintain the use of css-loader in all cases, the raw-loader could be swapped with something along the lines of exports-loader?module.exports.toString().

[dave-kennedy]

Fixes 3534?

[clydin]

@dave-kennedy, unrelated.
This addresses an issue in master.

[clydin]

/cc @filipesilva

[hansl]

@clydin thanks for the PR. Yours seems better than mine. Could you add the same test that I added to my PR? That way we can avoid regressing over this big in the future. Thanks

[googlebot]

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[clydin]

Added your test.

[hansl]

Okay you'll need to sign the CLA and everything is good.

[filipesilva]

@clydin thank you for fixing this. Reading through your fix I see that I mistakenly added css-loader to component css, whereas it needs to only have raw-loader instead.

This supersedes #3588 as the correct solution.

[filipesilva]

@clydin can you squash the commits into a single one authored by you? That's what's messing up the CLA.

[googlebot]

CLAs look good, thanks!

[clydin]

@filipesilva, that's annoying.

Ok. Squashed.

[filipesilva]

@clydin thank you, waiting on CI for merge.

[hansl]

LGTM. Thanks!

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