[Help] Add help for delete preference
<p><strong>Update search result as you type</strong><br/>
When this is ticked, search results in the Model Tree are updated as you type (default). If not ticked the search result will update when the Return key is pressed.</p>
+ <p><strong>Always warn when deleting objects</strong><br/>
+ When this is ticked a warning is always displayed when objects are deleted in the Models Tree. If unticked, a warning is only displayed when deleting objects if the objects are used in Views.
+
<br/>
<h3>Other</h3>
