In `sanitize_file_name()`, replace `%20` and `+` with dashes. Remove unnecessary code from `_wp_handle_upload()`.

Adds unit tests.

Props ericmann.
Fixes #16330.

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Add exif `orientation` to data extracted in `wp_read_image_metadata()`.

Props shanebp.
Fixes 28916.

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git-svn-id: http://core.svn.wordpress.org/trunk@29073 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Whitelist `input` types that are styled in the scope of `.form-field`.

Props mauteri.
Fixes #28647.

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git-svn-id: http://core.svn.wordpress.org/trunk@29074 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Correct a few `@param` docs for `$walker`.

Props dnaber-de.
Fixes #29011.

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