[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/modules/mob/dead/observer/observer.dm

@@ -323,7 +323,7 @@ This is the proc mobs get to turn into a ghost. Forked from ghostize due to comp
 	ghostize(FALSE) // FALSE parameter is so we can never re-enter our body. U ded.
 	return TRUE
 
-/mob/camera/verb/ghost()
+/mob/eye/verb/ghost()
 	set category = "OOC"
 	set name = "Ghost"
 	set desc = "Relinquish your life and enter the land of the dead."
@@ -704,7 +704,7 @@ This is the proc mobs get to turn into a ghost. Forked from ghostize due to comp
 
 //this is called when a ghost is drag clicked to something.
 /mob/dead/observer/mouse_drop_dragged(atom/over, mob/user)
-	if (isobserver(user) && user.client.holder && (isliving(over) || iscameramob(over)))
+	if (isobserver(user) && user.client.holder && (isliving(over) || iseyemob(over)))
 		user.client.holder.cmd_ghost_drag(src, over)
 
 /mob/dead/observer/Topic(href, href_list)

code/modules/mob/dead/observer/orbit.dm

@@ -285,7 +285,7 @@ GLOBAL_DATUM_INIT(orbit_menu, /datum/orbit_menu, new)
  * Helper POI validation function passed as a callback to various SSpoints_of_interest procs.
  *
  * Provides extended validation above and beyond standard, limiting mob POIs without minds or ckeys
- * unless they're mobs, camera mobs or megafauna. Also allows exceptions for mobs that are deadchat controlled.
+ * unless they're mobs, eye mobs or megafauna. Also allows exceptions for mobs that are deadchat controlled.
  *
  * If they satisfy that requirement, falls back to default validation for the POI.
  */
@@ -294,7 +294,7 @@ GLOBAL_DATUM_INIT(orbit_menu, /datum/orbit_menu, new)
 	if(!potential_mob_poi.mind && !potential_mob_poi.ckey)
 		if(!mob_allowed_typecache)
 			mob_allowed_typecache = typecacheof(list(
-				/mob/camera,
+				/mob/eye,
 				/mob/living/basic/regal_rat,
 				/mob/living/simple_animal/bot,
 				/mob/living/simple_animal/hostile/megafauna,