These properties were previously being checked much later, during xptcodegen,
and causing methods to be treated as noscript implicitly.
This change enforces the noscript requirements earlier when possible in
xpidl.py, to produce better errors, and adds addiitonal checks to ensure that
types which need to be builtinclass are marked as such.
This required some changes to interfaces in order to satisfy the new checks.
Differential Revision: https://phabricator.services.mozilla.com/D207804
