Relegate lists of function calls and hook implementations to separate pages

Migrated issue

Reported by: psynaptic

With a large codebase the number of calls or implementations of a hook can be significantly large. An example is drupalcontrib.org which has 5014 functions that call drupal_get_path() resulting in a 2M response for just the HTML.

As a first step I think we should move the list of calls and implementations off the main function page. The UI can remain the same since the expandable list is currently toggled by a link and this would only need to change to use the path to the new pages.

The result of this is the main function page will be much lighter and the potentially expensive information is still available when needed.