Bugfix and clean-up
- Added NPC const
- Added checkdragon() in F_CashReset
- Clean-up books.txt, fortune.txt, card_trader.txt, 3rd_trader.txt, stone_change.txt, quests_brasilis.txt
- Minor fix about Weight in comodo_gambling.txt
- Change to F_GM_NPC function in Mercenary Guild Switch follow up bdab851129ceee57a38ccc9d819b42011ef19fb7
- added Mercenary Switch in gm_npcs.txt list
- change to common green maiden in 2010 Headgear Quests

Signed-off-by: Capuche <capucrath@gmail.com>
Macro clean up for Element, Race, Race2, Class, & Size validation check

Signed-off-by: Cydh Ramdh <house.bad@gmail.com>
-Fix some CppCheck
-Fix bugreport:9088 (constant not always recognize if stating by number) thx to Hercule is_number
-Add infos on read_constant for check/debug
Bug Fixes:
- Fixed wrong check added at e7b654a (bugreport:9095)
- Spirit sphere reduces damage for skill hit num < 0, eg. MO_TRIPLEATTACK has hit num -3. (bugreport:9094)
Misc:
- Removed unused parameters in battle_calc_bg_damage() and battle_calc_gvg_damage()
- Some random src docs.

Signed-off-by: Cydh Ramdh <house.bad@gmail.com>
- Fixed 'atcommand' script failure for group with 'command_enable: false' (bugreport:9050)
- Replaced 'atcommand_max_stat_bypass' config (conf/gm.conf) to group permission 'bypass_max_stat'

Signed-off-by: Cydh Ramdh <house.bad@gmail.com>
Merge pull request #4 from rathena/master

Mergin