An Intro content provider that populates a list of frequently-used commands
from an extension point. The appearance of these quicklinks is normally taken
from the command metadata, including the image icon, but can be tailored.
These tailorings can be made optional depending on the current theme.
This implementation is still experimental and subject to change. Feedback
welcome as a bug report on the Eclipse Bugzilla
against Platform/User Assistance.
Dispose of the ContentProvider. This will only be called when the Intro
view is closed. In other words, the content provider will not be disposed
of until the last possible minute. This gives the implementor the chance
to cache content and avoid regenerating content on every page switch.