#308137: Filters were incorrectly checking for current user permissions on header/footer/empty text.

Default style renderer could not handle styles that did not use a row plugin; merged views_plugin_style_table::render() into views_plugin_style::render() to address this.

query::add_field() called ensure_table too aggressively and could cause aliases to improperly overwrite already existing tables.

#299042: Clear the entire theme registry cache, not just the current one, when hitting the rescan button.

#306177: Fix wording on overriding text to remove implication that filters, argumets, et al must be overridden together.

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.