Merge the four media buttons into one.

* Lots of red.
 * Removes the type_url_form_\$type filter, where \$type is audio, video, file, or image.
 * Replacement filter is a generic type_url_form_media filter for the new unified form.
 * Some functions have gone missing; they'll be restored and deprecated in a later pass.
see #17578.



git-svn-id: http://svn.automattic.com/wordpress/trunk@18831 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/css/media.dev.css

@@ -362,3 +362,18 @@ h4.media-sub-title {
 	margin-right: 25px;
 }
 
+p.media-types {
+	margin: 1em;
+}
+
+tr.not-image {
+	display: none;
+}
+
+table.not-image tr.not-image {
+	display: table-row;
+}
+
+table.not-image tr.image-only {
+	display: none;
+}