* Nightmare clocktower
This is a merge from HerculesWS/Hercules@88c5a47 originally done by @Ridley8819.
All the credits belong to him.
@aleos89 cleaned up some of the grammar and removed duplicate texts.
@secretdataz added the missing mapflags.
@Atemo adjusted Cursed Book item script
* Moved mapflags from conf/mapflag/ to npc/mapflag/.
* Split some files into npc/pre-re/mapflag/ and npc/re/mapflag/.
* Moved all Renewal maps into the /re/ directory.
* Applied Hall of Abyss mapflag changes in the /re/ directory.
git-svn-id: https://svn.code.sf.net/p/rathena/svn/trunk@17347 54d463be-8e91-2dee-dedb-b68131a5f0ec