Add pain immunity to some things that should prolly have it anyways

[Absolucy]

About The Pull Request

This adds full pain immunity to the following things:

• Florida Man
  • also kinda cleaned up florida man code in general
• Juggernaut Suit
• Ascended rust heretics (only while on rust)
• Zombies
• Nightmares
  • Zombies and nightmares already had TRAIT_NO_PAIN_EFFECTS, I just added the other traits related to negating pain, just to make 100% sure.
• Bloodsuckers
  • Fortitude provides pain immunity - it already had TRAIT_ANALGESIA, this is just making sure it fully covers everything.
  • Torpor fully heals all pain now, as it does with most other damage and effects.
  • The Sol debuff now adds a 50% increase in pain for bloodsuckers when they're out during Sol.

In addition, ascended blade heretics will heal their pain and reduce their shock buildup when their lifesteal triggers (upon attacking a living mob with their blade)

Why It's Good For The Game

Pain is still not really fully accounted for by many things (latest example being #4391), so this should help alleviate that somewhat.

also i did clean up some code + add some checks to hopefully reduce the chances of runtime errors

Changelog

🆑
fix: Zombies and nightmares should now properly be immune to pain.
balance: The Cybersun Juggernaut suit now provides the wearer with immunity to pain and its effects.
balance: Florida Man is now immune to pain and its effects.
balance: Ascended rust heretics, while on rusted tiles, are immune to pain and its effects.
balance: Ascended blade heretic lifesteal now heals pain and reduce shock buildup.
balance: Bloodsuckers are now fully immune to pain and its effects while Fortitude is active.
balance: Bloodsuckers now heal off pain while in torpor.
balance: Bloodsuckers gain a 50% increase in pain from the debuff applied while out during Sol.
code: Added some additional sanity checks to pain code, to prevent potential runtime errors.
/:cl: