VID-370 - Keep Wall code contained

Use a hook to call out to wall code.  When Wall/Forum isn't loaded, the hook doesn't fire and nothing is converted
VID-370 Don't create the new object!
VID-370 Add a function comment
VID-370 The old (new) style of registering hooks
Merge pull request #983 from Wikia/VID-370-FatalsFilePage

VID-370 - Keep Wall code contained