Match background color in DFW and adapt the dashed outline color.

fixes #28330. props avryl, ipstenu.
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Use the word "Count" instead of the post type label in taxonomy list tables to prevent layout issues. It is also more accurate, as it represents a count of all post types, not just one.

props philipjohn, GaVrA, seanchayes. fixes #17209.

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git-svn-id: http://core.svn.wordpress.org/trunk@29121 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Clarify that `get_the_date()`, `get_the_time()`, `get_post_time()` and `get_post_modified_time()` should return `false` when `get_post()` is `null`.

Adds unit tests.

Props GaryJ, SergeyBiryukov, tollmanz.
Fixes #28310.

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Revert [28640] as per @DH-Shredder.

See #24380.

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