Email address format validation

[wangf1122]

This feature is to validate for all email formatting based on existing schematron validation logic for schematron-rules-multilingual.sch and schematron-rules-non-multilingual.sch

[ianwallen]

@wangf1122

I just tested with empty emails and I see the following. As we already have an error for an empty email - there is no need to also show the invalid email. - I would expect this to only show the missing required email messages in this case.

[wangf1122]

I did some extra fix to have the validation with allowEmptyEmail option. So in this case, the shematron validation logic wont be duplicated. Here is the test result