Add some unit tests for `is_object_in_term()`.

These tests check a number of the ways that different kinds of values for
`$terms` (integers that match term_id, strings that match term_id or name or
slug) are handled.

See #29467.
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git-svn-id: http://core.svn.wordpress.org/trunk@30204 1a063a9b-81f0-0310-95a4-ce76da25c4cd
In `in_object_in_term()`, only check numeric string values against term_id.

The previous `in_array()` check was playing too loose with mixed types, such
that a string like '10_term_name' would incorrectly match a term_id 10.

Props nobinobi, realloc.
Fixes #29467.
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Add unit tests for `wp_validate_boolean()`.

Props TobiasBg.
See #30238.
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Ignore case when checking string 'false' in `wp_validate_boolean()`.

Props TobiasBg, kitchin.
Fixes #30238.
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Twenty Fifteen: make it clear that a link is a link in post and comment meta by underlining it on hover or focus

Props morganestes, iamtakashi, fixes #30108


Built from https://develop.svn.wordpress.org/trunk@30208


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Introduce `term_template` param to `get_the_taxonomies()`.

This parameter allows theme and plugin authors to specify the formatting they
would like on the term links as they are parsed into the taxonomy list.

Props hereswhatidid, dlh, davidjlaietta.
See #27238.
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git-svn-id: http://core.svn.wordpress.org/trunk@30209 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Improve docblocks for `get_the_taxonomies()` and `the_taxonomies()`.

* In `the_taxonomies()`, only document those arguments that are specific to the function. Arguments shared with `get_the_taxonomies()` should be documented in the later function's docblock.
* Add $args hash documentation to `get_the_taxonomies()`.
* Remove the redundant default argument definition in `the_taxonomies()`.

Fixes #27238.
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git-svn-id: http://core.svn.wordpress.org/trunk@30210 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Twenty Fifteen: prevent a flash of visible sub menus before scripts load.

Props mattwiebe, aferica, fixes #30056.


Built from https://develop.svn.wordpress.org/trunk@30211


git-svn-id: http://core.svn.wordpress.org/trunk@30211 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Twenty Fifteen: add a fallback icon for social links where we don't have an icon

Props iamtakashi, fixes #30148


Built from https://develop.svn.wordpress.org/trunk@30212


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Twenty Fifteen: nicer styles for playlists.

Props iamtakashi, fixes #30163


Built from https://develop.svn.wordpress.org/trunk@30213


git-svn-id: http://core.svn.wordpress.org/trunk@30213 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Customizer: Add stable sorting for panels, sections and controls in JS. Improve sorting in PHP.

props westonruter.
fixes #30225.
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git-svn-id: http://core.svn.wordpress.org/trunk@30214 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Twenty Fifteen: Make sure that the edit link will always be right of it's icon.

Props iamtakashi, fixes #30171.



Built from https://develop.svn.wordpress.org/trunk@30215


git-svn-id: http://core.svn.wordpress.org/trunk@30215 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Twenty Fifteen: Use new core navigation tags.

Props obenland, iamtakashi, fixes #30189



Built from https://develop.svn.wordpress.org/trunk@30216


git-svn-id: http://core.svn.wordpress.org/trunk@30216 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Twenty Fifteen: kern everything -- it reads better.

Props afercia, fixes #30195.



Built from https://develop.svn.wordpress.org/trunk@30217


git-svn-id: http://core.svn.wordpress.org/trunk@30217 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Twenty Fifteen: escaping for the HTML5 shiv call.

Props philiparthurmoore, fixes #30212



Built from https://develop.svn.wordpress.org/trunk@30218


git-svn-id: http://core.svn.wordpress.org/trunk@30218 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Customizer: Bind `input` and `propertychange` events for range input types.

props voldemortensen, westonruter.
fixes #30223.
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git-svn-id: http://core.svn.wordpress.org/trunk@30219 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Twenty Fifteen: Remove a gap between content and footer when the sidebar is longer than the content.

Props iamtakashi, fixes #30228.



Built from https://develop.svn.wordpress.org/trunk@30220


git-svn-id: http://core.svn.wordpress.org/trunk@30220 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Twenty Fifteen: check if user-selected custom colors are the same as default so we're not duplicating styles.

Props iamtakashi, fixes #30234


Built from https://develop.svn.wordpress.org/trunk@30221


git-svn-id: http://core.svn.wordpress.org/trunk@30221 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Twenty Fifteen: correct image alignment for RTL.

Props iamtakashi, fixes #30239.



Built from https://develop.svn.wordpress.org/trunk@30222


git-svn-id: http://core.svn.wordpress.org/trunk@30222 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Introduce some new template functions for archive titles and descriptions:

 * `get_the_archive_title()` and `the_archive_title()` for returning/displaying the title of the current term, date, post type, post format, or author archive.
 * `get_the_archive_description()` and `the_archive_description()` for returning/displaying the description associated with the current term archive.

Fixes #21995
Props obenland, DrewAPicture

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