A few assorted balance changes

[woisalreadytaken]

The first two changes especially are experimental and subject to reverts if they don't play too well.

• On-hit effects from weapons that were changed from on-kill effects no longer apply on minions (for example: Half-Zatoichi healing doesn't work on minions, but Blutsauger healing does)
• Soldier's crit-rockets-when-aiming-at-boss thing no longer applies on minions
• Fixed Pyrocar applying anti-heal on itself instead of on enemies when hitting anything with its flamethrower
• Saxton Hale no longer gets crit immunity on rage (the defense buff is still there)
• HHH Jr. now heals for 125% of damage dealt during rage, instead of 200%