Views doesn't respect $plugin['base'] for some plugin types

In many places, views_fetch_plugin_names() is called without the base table passed in as the third param, making it impossible to filter the plugins by base table.
So specifying "base" works for style and row plugins, but not for display and exposed_form plugins, etc...

This is an important feature because it allows us to limit certain plugins to entity tables only (to be used in entityreference, entityreference_view_widget...)
Media also uses it for its style and display plugins.