API: Create a module bundle for 'apipretty' and 'apihelp'

API: Create a module bundle for 'apipretty' and 'apihelp'

These are both fairly small modules used in related low-traffic
scenarios. The cost of registering both globally on all page views
as a top-level entry point does not seem worth the marginal gain
of loading only one of these two in the contexts where they are
needed.

Change-Id: I42458ebec3f8d6e14e52e44d62fb914fcbeda5db