Use hard coded strings for page hooks.

This is so this can be loaded sooner than admin_init.
Add the submit endpoint for Form.
List actions are user sortable. Improve cat select options.
Settings API code cleanup. Update list actions options to be user sortable.
Move cnTemplatePart::entryActions() up in code to be with listActions.
Replace "\n" with PHP_EOL.
Entry action are now user sortable.
Tweak inline radio padding.
Add missing cn_email shortcode to cnEntry_Shortcode.
Rename filters for metabox atts.
Update cnRetrieve::entry() to support query by slug.
Update cnTemplatePart::category(), add name attr.
Add edit endpoint.
Update rewrite rules to support edit endpoint.
Add hide option to cnMetabox_Render::metabox().
Add support for the edit endpoint to shortcode process switch.
Move default visibilty setting from cnEntry_Action to cnEntry.
Add additional notes to cnMetabox_Render.
Remove extra div tag.
Adjust tab postion valies for SEO and Advance.

Also removed unused field settings.