Ftw.theming

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- 1.8.1 was accidentally released from the wrong branch. Please use 1.8.2 instead.
[Kevin Bieri]

- Use two columns for print layout.
[Kevin Bieri]

- Avoid duplicate (mimetype) icons on "Image" types. [jone]

- Introduce new mixins

- Introduce link-color helper
- Introduce font-face helper
- Introduce rem helper

[Kevin Bieri]

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- Switch from "private" to "public" caching, since the CSS does
not contain any user specific data. [jone]

- Fix caching for unpublished navigation roots by not using p.a.caching. [jone]

- Introduce appearance helper
[Kevin Bieri]

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- Support replacing portal-type- and mimetype-icons. [jone]

- Fix support for mimetype icons having long names. [jone, mbaechtold]

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- Fix multi-fill support of embed-resource mixin,
introducing a new syntax and signature. [Kevin Bieri]

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- Reduce tab hover state
The current hover state will be always the selected state
[Kevin Bieri]

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- Move zindex system from plonetheme.blueberry
[Kevin Bieri]