Rearranged the templates around CMSPagesController_ContentToolbar and
uncommented the toolbar from the pages list view so the add new button
would be included with including actions that aren't applicable to the
gridfield.
Linked to https://github.com/silverstripe/sapphire/pull/684/commits
ENHANCEMENT Namespaced tree search parameters in CMSMain, in order to detect more reliably if a filter has been applied. Changing page search form to standard pushState behaviour, same as ModelAdmin (for both tree and list view).
MINOR Refactored list view loading
