#881680 by brianV and longwave: Avoid unnecessary invoking of view objects for argument validation when no argument validation is necessary.

#772782 by mstrelan: Menu normal item menu should default to system default menu rather than  "navigation".

#653628 by dagmar and dereine: Ensure child method declarations match parent method declarations to prevent notices.

#503452: Retool exports to properly use option definition, improving translatability and information use.

#284893 by moshe: Allow Views to pick which menu a menu item appears in. Only works in Drupal 6.5 or later.

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.