Official Item Group/Package/Chain

http://hercules.ws/board/topic/1244-official-item-grouppackagechain/
Also
Further implemented itemdb.c/storage.c interfaces, and a minor update to db2sql plugin.

Signed-off-by: shennetsind <ind@henn.et>
Follow up fcba8a2161a392369db99ab9a516a24470c54796

Amazing, all my huge commits end up having debug left overs no matter how hard I try to not leave any behind T___T so sad ;__; /embarrassed

Signed-off-by: shennetsind <ind@henn.et>
Fixed Bug #7420

http://hercules.ws/board/tracker/issue-7420-killing-the-npc/
Special Thanks to kyeme, frost, ossi0110

Signed-off-by: shennetsind <ind@henn.et>
Update

- Fixed some documentation
- Fixed some alignment
Merge branch 'master' of https://github.com/HerculesWS/Hercules