Implemented 2012 Headgear Quests.
Credits to @cydh for helping out with the quest bonus.
Follow-up 1a9b54: added missing SQL item_db entries.

Clarified description of "delayed consumption" item type (11) in item_db documentation. (tid:91187, thanks Annie!)

Signed-off-by: Euphy <euphy.raliel@rathena.org>