Skill SP Costs and Cooldowns

[Terotrous]

Many skills have abilities or conditions that affect their SP cost, overheat charges, or overheat time. For example, the Ranger ability Ranger39 reduces the overheat time of the skill by 5 seconds. Currently we don't implement these in any consistent way (and for most skills they aren't implemented at all). Perhaps skill handlers should also have methods to get the SP cost / charges / overheat duration of a skill, which they could simply leave unimplemented for the current behavior?