Defining Part 4 - Code cleanup toward defines (... and the rest) (#19388)

* I wasn't done

* nits

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

@@ -548,10 +548,11 @@ This is the proc mobs get to turn into a ghost. Forked from ghostize due to comp
 	set name = "Analyze Air"
 	set category = "Ghost"
 
-	if(!istype(usr, /mob/dead/observer)) return
+	if(!isobserver(usr))
+		return
 
 	// Shamelessly copied from the Gas Analyzers
-	if(!( istype(usr.loc, /turf) ))
+	if(!isturf(usr.loc))
 		return
 
 	var/datum/gas_mixture/environment = usr.loc.return_air()
@@ -617,7 +618,7 @@ This is the proc mobs get to turn into a ghost. Forked from ghostize due to comp
 		if(A.client && A.eyeobj) // No point following clientless AI eyes
 			. += "|<a href='byond://?src=[ghost.UID()];follow=[A.eyeobj.UID()]'>eye</a>"
 		return
-	else if(istype(target, /mob/dead/observer))
+	else if(isobserver(target))
 		var/mob/dead/observer/O = target
 		. = "<a href='byond://?src=[ghost.UID()];follow=[target.UID()]'>follow</a>"
 		if(O.mind && O.mind.current)

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

@@ -11,6 +11,6 @@
 
 /mob/dead/observer/handle_speaker_name(mob/speaker = null, vname, hard_to_hear)
 	var/speaker_name = ..()
-	if(speaker && (speaker_name != speaker.real_name) && !isAI(speaker) && !istype(speaker, /mob/living/automatedannouncer)) //Announce computer and various stuff that broadcasts doesn't use it's real name but AI's can't pretend to be other mobs.
+	if(speaker && (speaker_name != speaker.real_name) && !isAI(speaker) && !isAutoAnnouncer(speaker)) //Announce computer and various stuff that broadcasts doesn't use it's real name but AI's can't pretend to be other mobs.
 		speaker_name = "[speaker.real_name] ([speaker_name])"
 	return speaker_name