TODO: spell casting

[Xiaoy312]

• analyse Skill structure
• find call for Casting
• make Casting call
• add new fighting strategy :
  • Basic : spam basic attack
  • Boss Killer : spam basic attack, and use spark as it becomes available
  • SpellCaster : spam primary skills to on cd & w/enough chi, and a list of fillers(or autos) to cast when none of primary skills are on cd