#468824 by eaton: Pluggable caching mechanism which can cache both the query result and rendered result.

#321589: Add comment node row  template suggestions just like te node row variant, since it's already documented that way.

Since it's not easily possible to do the views filter block externally, bring the functionality directly into Views, including modifying the ajax for that to work.

Reworked access control to be a plugin. This will have the beneficial effect of drastically reducing Views load during menu access checks.

Major re-organization of handlers. PLEASE NOTE: This drastically affected the Views module API and until modules are updated to match, they will stop working. Efforts have been made to ensure that this won't cause your site to crash, but that's partly up to the individual module as well.