Revert [25202] and enforce that wp_add_inline_style() does not want <style> tags.

Prior to 3.7, these tags were not printed (and thus needed to be provided), but only in the admin and when concatenation was enabled. They should never be required. Strip them when we find them and issue a notice for incorrect usage.

props atimmer, georgestephanis.
fixes #24813.

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Fix a misspelling of the filter we're checking for, s/fs_method/filesystem_method/.
My bad. See #22704, [25781].

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Twenty Fourteen: first pass at CSS revamp, props iamtakashi. See #25592.
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Twenty Thirteen: use correct font name in comment docs, props tenpura. Fixes #25593.
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Twenty Fourteen: remove `style` tags from accent color output, following r25786. Fixes #25599, props celloexpressions.
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Twenty Thirteen: fix description layout on attachment outputs, props obenland. Fixes #25578.
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Twenty Fourteen: minor fixes to docs, props celloexpressions. See #25257
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