Issue #1070058 by jessebeach: Implement a new dropdown button that is somewhat nicer than the older dropdown.

#1065976 by tekante and David_Rothstein: Reset plugin static cache during module enable to prevent stale data from harming export ui.

#999302 by troky: Fix jump menu. Apparently this wasn't actually committed the last time it was committed.

#941800 by me and aspilicious: Use Drupal 7 #machine_name automation on page manager pages and all export_ui defaults.

#951048 by EclipseGc: Tighter entity integration so that new entities are automatic contexts and relationships.

Retool dependent.inc to use #pre_render instead of #process so as not to set javascript for form items that will never be seen.

#998870 by Amitaibu: Fix notice when content has no icon by using function already designed for that.

#995026: Fix export UI during enable/disable which would throw notices and not properly set/unset menu items.

#959206: If a context is not set when rendering content, attempt to guess the context (fixes Views panes where "From context" was added but pane was never edited.)