Helen Hou-Sandí 97b412af37 Admin notices: Add more variety and make more generically usable.
There is now a base class of `notice`, with additional classes of `notice-success`, `notice-warning`, `notice-error`, and a new blue `notice-info`.

Also corrects some misleading notice colors, such as plugin tested up to warnings and login messages.

props avryl, melchoyce.
fixes #27418.

Built from https://develop.svn.wordpress.org/trunk@30505


git-svn-id: http://core.svn.wordpress.org/trunk@30494 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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