* Removed `ENABLE_ITEM_GUID` from src/config/core.h, after long time introduction it's worth to be enabled by default. Just remove all items with GUID flag if want to remove it generates GUID .
* Implemented client interface to merge the items. Packet struct credits: 856b6f1feb
* Edited `mergeitem` script command to use the interface, moved the 'old' `mergeitem` to `mergeitem2`.
* Fixed the behavior to add GUID'd item to inventory in Cash Shop.
* Updated item_flag.txt for listing `IT_CASH` items (item type 18).
* NOTE: `IT_CASH` items which defined in item_flag.txt with flag `4`, cannot be merged.
* NOTE: Please check the packets for older clients. Tested work on 2012-04-10, 2013-08-07 and 2014-10-22.
* NOTE: Please import 'upgrade_20150804.sql' for MySQL Log Database.
* Removed duplicate clif functions:
* `clif_msgtable()` -> `clif_msg()`
* `clif_msgtable_num()` -> `clif_msg_value()`
* Item DB Updates:
* Indonesia_Box2 (17079) should gives 5x Wing_Of_Butterfly (602).
* Changed some item types to 18.
Signed-off-by: Cydh Ramdh <cydh@pservero.com>
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