Refactors Regenerate Organs, and a few organ helpers (#74219)

## About The Pull Request

Refactors regenerate organs to be slightly more intelligent in handling
organ changes and replacements.
Noteably:
- We don't remove organs that were modified by the owner; such as
changing out your heart for a cybernetic
- We early break out of the for loop if they aren't supposed to have an
organ there and remove it
- We check for the organ already being correct, and just healing it and
continuing if it is

Also changes the names of some of the organ helpers into snake_case
### Mapping March
Ckey to receive rewards: N/A

## Why It's Good For The Game
## Changelog

---------

Co-authored-by: Jacquerel <hnevard@gmail.com>

code/modules/admin/view_variables/topic.dm

@@ -95,7 +95,7 @@
 					newamt = L.getOxyLoss()
 				if("brain")
 					L.adjustOrganLoss(ORGAN_SLOT_BRAIN, amount)
-					newamt = L.getOrganLoss(ORGAN_SLOT_BRAIN)
+					newamt = L.get_organ_loss(ORGAN_SLOT_BRAIN)
 				if("clone")
 					L.adjustCloneLoss(amount, forced = TRUE)
 					newamt = L.getCloneLoss()