auto-add additional mediawiki template parameters as creator template values

* expanded on the $_sub_templates array for creator so that it now contains
  a list of mediawiki template parameters that use the template
* the new array list is used to test whether or not the mediawiki template
  being used has any matching parameters and if so, use the template if a value
  for the parameter exists in the metadata

Bug: 63822
Change-Id: I6e414b4d1c552a532812cf62c5642327a968366d
Merge "auto-add additional mediawiki template parameters as creator template values"