[css-ui-4] Add a few properties to the "do not ignore" list of appearance

Author: frivoal

css-ui-4/Overview.bs

@@ -871,6 +871,12 @@ However, the following properties must not be disregarded:
 	<li>'left'
 	<li>'float'
 	<li>'clear'
+	<li>'margin' and related long-hand properties
+	<li>'unicode-bidi'
+	<li>'direction'
+	<li>'all' <span class=note>This does not imply a requirement to apply all the properties reset by 'all'</span>
+	<li>'cursor'
+	<li>'z-index'
 </ul>
 
 Issue: Are there more properties should include in this list?