Fixed skill delunit problem on packetver > 20120418 && < 20130000

Special Thanks to Judas

Signed-off-by: shennetsind <ind@henn.et>
Modified how itemdb->names is populated

Not only does it fix the itemdb2 name override problem, its also more efficient :P
Special Thanks to kyeme for bringing this issue to our attention

Signed-off-by: shennetsind <ind@henn.et>
Extended 'ID<item_id>' syntax to item packages and item groups.

Signed-off-by: shennetsind <ind@henn.et>
Fixed Bug #7485

Special Thanks to Igniz
http://hercules.ws/board/tracker/issue-7485-crash-on-reloadscript/

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