Media: Make friends with media_upload_form. Adds notices for browser...

Media: Make friends with media_upload_form. Adds notices for browser incompatibility, upload limits, maximum file size, and large file issues to the uploader. fixes #22243, see #22186, #21390.


git-svn-id: https://core.svn.wordpress.org/trunk@22821 1a063a9b-81f0-0310-95a4-ce76da25c4cd