Media: Add a basic starting frame for upload/library selection.

`media.view.MediaFrame.Select` is a frame class with a handful of sensible defaults to handle selecting and uploading items in the media library.

see #21390.


git-svn-id: https://develop.svn.wordpress.org/trunk@22494 602fd350-edb4-49c9-b593-d223f7449a82

wp-includes/script-loader.php

@@ -328,6 +328,7 @@ function wp_default_scripts( &$scripts ) {
 		// Generic
 		'insertMedia' => __( 'Insert Media' ),
 		'search'      => __( 'Search' ),
+		'select'      => __( 'Select' ),
 		'cancel'      => __( 'Cancel' ),
 		'addImages'   => __( 'Add images' ),
 		'selected'    => __( 'selected' ),