SensitivePhoneNumbers: Expand XML parsing

* Allow each item to carry additional infos:

<item>
   <name>SomeNameHere</name>
   <number>1234</number>
   <someTag>someValue</someTag>
</item>

* We treat all but <number> as optional
* This way we can show info we have and skip what
  we don't know

Change-Id: I724d9ac25ce8a0ae7f69ec513ba9796b06c9e7f2