Add stub menu_entries_cbs.c/menu_entries_cbs.h
Implement action_ok for one function already
(Menu entries cbs) Move another entry over
(Menu entries cbs) Move another setting over
(menu_entries_cbs.c) - Cleanups
Reimplement history_list action OK
Start moving menu_action_ok over as well
Merge pull request #1126 from lakkatv/xmb

(XMB) Start implementing xmb_populate_entries
(XMB) use PNG background if present