Twenty Fifteen: clean up sprintf from template tags and use the correct escaping for twentyfifteen template tags.

Props aprea, obenland, fixes #30319


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Use a brighter blue against dark backgrounds in the admin menu and toolbar.

Not only does this pass contrast guidelines, but it also visually appears closer to the original highlight blue used against light backgrounds.

props melchoyce. fixes #30323.

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Twenty Fifteen: adding context to page links for screenreaders.

Props afercia, fixes #30174.


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Twenty Fifteen: since color schemes can be customized let's call them base color schemes instead of just color schemes.

Props celloexpressions, iandstewart, fixes #30316


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Twenty Fifteen: adding context to pagination links for screenreaders.

Props afercia, iamtakashi, fixes #30152


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Twenty Fifteen: improve appearance of page links when there are tons of pages to link to

Props iamtakashi, fixes #30301


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TinyMCE: enhance the inline toolbar for images:
- Add alignment (left, center, right, none) buttons.
- Position the menu above the image when possible, except on iOS.
- Fix selecting images on iOS.
First run, part props avryl. See #30147.
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git-svn-id: http://core.svn.wordpress.org/trunk@30317 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fix typo in translatable string, see #30147.

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git-svn-id: http://core.svn.wordpress.org/trunk@30318 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Manually delete fixture in `test_mysqli_flush_sync()`.

This test creates a dummy post and subsequently runs a query containing
`DROP PROCEDURE`. This latter query implies a `COMMIT`, which means that the
post is not cleaned up for later tests. Manually deleting the post with
`wp_delete_post()` solves this problem.

Fixes #28155.
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Twenty Fifteen: reduce the margins on the editor body in esitor-style.css. Fixes #30331.
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git-svn-id: http://core.svn.wordpress.org/trunk@30320 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Introduce `$post_type` param for `count_user_posts()`.

Props Caspie, engelen, DrewAPicture.
Fixes #21364.
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Pass query object to 'the_post' filter.

Props tlovett1.
Fixes #30327.
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Twenty Fifteen: unfix the sidebar if we have a menu with submenus as there is a chance visitors might not be able to scroll down to see submenus in some situations.

Props mattwiebe, fixes #30208.


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Twenty Fifteen: cleaning up JS introduced in r30305 that doesn't pass jshint.

Props boonebgorges, fixes #29988.


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