Show Special Skills (like Twister and Whirlwind)'s MP Costs

Show the mp costs of special skills in-game for two reasons:

  1. It helps players judge the cost of each weapon (people don’t worry about the primary skill’s mp and that number tells us nothing about the special mp usage)
  2. Track possible bugs with mana – I am of the opinion that more factors in to mp than level, type, and weapon quality (base costs).

I still have this on my to-do list, will try to find a patch to include this.