Integrate sanitizer with host UI, sanitize at shutdown support, and control which items are sanitized when more thoroughly. Closes issue #70.

common/locale/en-US/options.xml

@@ -1174,6 +1174,16 @@
     </description>
 </item>
 
+<item>
+    <tags>'sanitizeshutdown' 'ss'</tags>
+    <spec>'sanitizeshutdown'</spec>
+    <type>stringlist</type>
+    <default/>
+    <description>
+        <p>The items to sanitize automatically at shutdown.</p>
+    </description>
+</item>
+
 <item>
     <tags>'sts' 'sanitizetimespan'</tags>
     <spec>'sanitizetimespan' 'sts'</spec>