* Follow up 8a66d82 and c70762a

git-svn-id: https://rathena.svn.sourceforge.net/svnroot/rathena/trunk@17541 54d463be-8e91-2dee-dedb-b68131a5f0ec
Follow up 8a66d82c28

-Add some missing case for RK_DRAGONBREATH_WATER
-Fix watk not being calculated properly with bonus in Re
-Rm leftover of previous skillcooldown system (skill_cooldown_load)
-Add skill_get_itemeq (accessor)

git-svn-id: https://rathena.svn.sourceforge.net/svnroot/rathena/trunk@17542 54d463be-8e91-2dee-dedb-b68131a5f0ec