Refactor link-type introspection into a new function. Add 'functionish' link type for function/method.
treat class='idl' same as class='interfacedef'.
Canonicalizethe for/dfn-for/link-for attributes.
Rename dfnTypes to dfnClassToType, add dfnTypes as a set of definition types.
Enforce that some types of dfns need to have a data-dfn-for attribute.
Automatically add a dfn-for to descdef tables.
Remove a lingering manual dfn type listing.
Don't autogen ids for props and descriptors.
Bah, syntax error.
Add 'idl' pseudo-link type, for shorter matching of idl types.
Initial commit of some local dfn for handling.