by joachim: Removed stray code accidentally committed from local development branch.
by joachim: Moved page title styling to block div for clarity.
by joachim: Fixed vertical alignment for title & tabs.
by joachim: Changed layout.css to be in the layout level of CSS in the library definition.
by joachim: Removed version property from .info, as we're no longer a core extension.
Issue #2646334 by joachim: Updated for title, tabs, actions are now blocks.
Issue #2646344 by joachim: Updated for logo and slogan output in branding block.
by joachim: Updated for core's removal of the passthrough twig filter.
by joachim: Removed obsolete messages region and mention of messages region in docs.
by joachim: Removed obsolete messages variable and mention of messages region in docs.
Issue #2465869 by joachim: Moved styling for header menus from the ULs to the regions.
by joachim: Changed shadow at bottom of header to be made with CSS box-shadow rather than background gradient, to allow the header to change its height.
Issue #2465605 by joachim: Changed page layout to use flexbox; replaced background images with CSS gradients and box-shadows.
by joachim: Fixed position of logo due to new SVG file not including any padding.
Issue #2465599 by joachim: Added rules for form styling that have gone from core.
Issue #2465597 by joachim: Fixed rules for user login block are also hitting the full page form.
by joachim: Fixed colour of rows on status report admin page.
Issue #2465305 by joachim: Fixed node author picture not showing.
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