Optimizations, Bug Fixes & New Article Options

 - Set depth to 0 when looking for Article Container children
 - Fixed right click Article Container > Write New links
 - Fix default template on Article Import (MODX)
 - fixed future publishing (uri built correctly)
 - removed Rich Text setting from Article Container (bold move)
 - added 'Editing Options' panel that currently just contains a Rich Text checkbox
      (rich text is now managed on the Article level rather than container level
 - added Clear Cache checkbox to Publishing Information panel)