* Added script command to generate <ITEML> string, itemlink and itemlink2
  * itemlink(<item_id>{,<refine>,<card0>,<card1>,<card2>,<card3>});
  * itemlink2(<item_id>,<refine>,<card0>,<card1>,<card2>,<card3>,<RandomIDArray>,<RandomValueArray>,<RandomParamArray>);
    * NOTE that random option params must be filled even the server/client is not support if using itemlink2
* Thanks to @lututui @exaxia @jchcc

* Added equip location & view string in createItemLink result
* Added base62_encode and base62_decode script command

* Shouldn't be pushed

* Changed str loop in `base62_decode` to `std::string::iterator`
* Removed pre-defined base62 for nameid, equip, and look (just somehow failure on loading item_db on Travis-CI, worried on Linux too)

# Conflicts:
#	src/map/itemdb.cpp
#	src/map/itemdb.hpp