Editor: Add 6 missing HTML5 semantic tags (data, meter, progress, search, time, wbr) and their attributes to KSES.

1. `data` (attribute: `value`)
2. `meter` (attributes: `high`, `low`, `max`, `min`, `optimum`, `value`)
3. `progress` (attributes: `max`, `value`)
4. `search`
5. `time` (attribute: `datetime`)
6. `wbr`

Props ramiy, rollybueno, westonruter.
Fixes #63786.


git-svn-id: https://develop.svn.wordpress.org/trunk@60886 602fd350-edb4-49c9-b593-d223f7449a82

Author: westonruter

src/wp-includes/kses.php

@@ -138,6 +138,9 @@
 			'valign'  => true,
 			'width'   => true,
 		),
+		'data'       => array(
+			'value' => true,
+		),
 		'del'        => array(
 			'datetime' => true,
 		),
@@ -243,6 +246,14 @@
 		'menu'       => array(
 			'type' => true,
 		),
+		'meter'      => array(
+			'high'    => true,
+			'low'     => true,
+			'max'     => true,
+			'min'     => true,
+			'optimum' => true,
+			'value'   => true,
+		),
 		'nav'        => array(
 			'align' => true,
 		),
@@ -262,6 +273,10 @@
 		'pre'        => array(
 			'width' => true,
 		),
+		'progress'   => array(
+			'max'   => true,
+			'value' => true,
+		),
 		'q'          => array(
 			'cite' => true,
 		),
@@ -272,6 +287,7 @@
 		'ruby'       => array(),
 		's'          => array(),
 		'samp'       => array(),
+		'search'     => array(),
 		'span'       => array(
 			'align' => true,
 		),
@@ -353,6 +369,9 @@
 			'charoff' => true,
 			'valign'  => true,
 		),
+		'time'       => array(
+			'datetime' => true,
+		),
 		'title'      => array(),
 		'tr'         => array(
 			'align'   => true,
@@ -393,6 +412,7 @@
 			'src'         => true,
 			'width'       => true,
 		),
+		'wbr'        => array(),
 	);
 
 	/**