"Second Wind" rules adapted for Mercs and Mecha

Since mechs don't actually "heal" in combat, second wind rules and "healing surges" work differently now.

Instead of healing damage taken in battle, a second wind is used as a standard action to dissipate excessive heat, beyond what could be dissipated with its heat sinks normally. Therefore second wind represents emergency measures taken by the pilot to increase the efficiency of heat dissipation (i.e. opening extra vents, rerouting flow of coolant, power-surging fans, etc.)

This becomes important when mechs use their special attacks and special abilities, which generate heat beyond that of regular weapon usage and movement.

Exactly how much heat points are dissipated using second wind remains to be determined.