Allow inline editing of width and height parameters while previewing an embed in the media modal:

* Use `wp.shortcode()` instead of manually constructing a shortcode in `views/embed/link`
* Allow a URL to transition to a shortcode (and vice versa) when returning an embed to TinyMCE
* In `WP_Embed`, store the last URL and last set of attributes requested in class properties
* `wp_ajax_parse_embed()`, allow `[embed]`s to have attributes. Return `attr` in the response.

This is a first pass to allow broad testing with recent MCE view changes. 

See #31139.


git-svn-id: https://develop.svn.wordpress.org/trunk@31620 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/css/media-views.css

@@ -1944,6 +1944,29 @@
 	clear: both;
 }
 
+.embed-link-settings .setting {
+	display: none;
+}
+
+.embed-link-dimensions:after {
+	content: '';
+	display: block;
+	clear: both;
+}
+
+.embed-link-dimensions .width,
+.embed-link-dimensions .height {
+	float: left;
+	width: 125px;
+	clear: none;
+	margin-right: 10px;
+}
+
+.embed-link-dimensions input {
+	width: auto;
+	max-width: 110px;
+}
+
 .image-details .embed-media-settings .setting {
 	float: none;
 	width: auto;
@@ -1990,6 +2013,7 @@
 .media-embed .setting span {
 	display: block;
 	width: 200px;
+	max-width: 100%;
 	font-size: 13px;
 	line-height: 24px;
 	color: #666;