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/mining/lavaland/tendril_loot.dm

@@ -540,7 +540,7 @@
 		if((methods & INGEST) && show_message)
 			to_chat(exposed_human, span_notice("<i>You feel nothing but a terrible aftertaste.</i>"))
 		return
-	if(exposed_human.getorganslot(ORGAN_SLOT_EXTERNAL_WINGS))
+	if(exposed_human.get_organ_slot(ORGAN_SLOT_EXTERNAL_WINGS))
 		to_chat(exposed_human, span_userdanger("A terrible pain travels down your back as your wings change shape!"))
 	else
 		to_chat(exposed_human, span_userdanger("A terrible pain travels down your back as wings burst out!"))