[NO GBP] Renames mob/camera to mob/eye and makes everything follow suit (#87684)

## Why It's Good For The Game

Clarity and consistency regarding DM's systems. 
Internally, `eye` is used for anything that controls the client's view.

![image](https://github.com/user-attachments/assets/7d1291e1-7a6a-4736-a14b-97834e89846f)
How `eye` is used in DM is consistent with how we use the term, so I
figured this would add clarity.

Being named mob/camera also makes it unclear exactly what it's doing.
The name implies that it would function similar to how mob/camera/ai_eye
does, but most of the time it's only used as... an eye.

My ulterior reason for this PR is that I want to clean up
mob/camera/ai_eye and it's subtypes after this.
## Changelog

🆑
server: mob/camera has been renamed to mob/eye, which may break
downstreams
/🆑

---------

Co-authored-by: Ghom <42542238+Ghommie@users.noreply.github.com>

code/game/objects/effects/temporary_visuals/effect_trail.dm

@@ -2,7 +2,7 @@
 /obj/effect/temp_visual/effect_trail
 	name = "effect trail"
 	desc = "An invisible effect, how did you examine this?"
-	icon = 'icons/mob/silicon/cameramob.dmi'
+	icon = 'icons/mob/eyemob.dmi'
 	icon_state = "marker"
 	duration = 15 SECONDS
 	invisibility = INVISIBILITY_ABSTRACT