feat(@angular/cli): optimize stylesheets after bundling

[clydin]

Re-structuring the webpack resource loader allows the new stylesheet optimizing plugin to process component styles as well as global styles. Global styles are now optimized as a whole rather than in isolated parts; allowing for more comprehensive optimizations.

Fixes #8598
Fixes #8640 (2nd commit)
Fixes #8934; Fixes #8891 (2nd & 3rd commit)

[rokerkony]

Hi guys,
after upgrade to CLI v1.6.3 (angular in v5.1.2) and removing node_modules and lock file I still have an error with Node#moveTo was deprecated. Use Container#append.

It seems that #8598 is not fixed yet :(

@clydin @filipesilva

[devoto13]

@rokerkony This PR is marked as feat, which means that it will be available only in CLI 1.7, not in patch releases of 1.6.

[rokerkony]

@devoto13 oh, I saw it in the release notes:
https://github.com/angular/angular-cli/releases

if it is as you say, I'll wait for that, thank you

[denny89k]

@devoto13 @rokerkony could i use some angular/cli version with angular 5 without this issue?

[devoto13]

@DzianisUkrainets you can try 1.7.0-beta.2.

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