Base implementation of /datum/persistent_client (#89449)

## About The Pull Request
Converts `/datum/player_details` into `/datum/persistent_client`.
Persistent Clients persist across connections. The only time a mob's
persistent client will change is if the ckey it's bound to logs into a
different mob, or the mob is deleted (duh).

Also adds PossessByPlayer() so that transfering mob control is cleaner
and makes more immediate sense if you don't know byond-fu.

## Why It's Good For The Game
Clients are an abstract representation of a connection that can be
dropped at almost any moment so putting things that should be stable to
access at any time onto an undying object is ideal. This allows for
future expansions like abstracting away client.screen and managing
everything cleanly.

code/modules/admin/verbs/admingame.dm

@@ -62,11 +62,10 @@ ADMIN_VERB_ONLY_CONTEXT_MENU(show_player_panel, R_ADMIN, "Show Player Panel", mo
 
 	body += "<b>Mob type</b> = [player.type]<br><br>"
 
-	if(player.client)
+	if(HAS_CONNECTED_PLAYER(player))
 		body += "<b>Old names:</b> "
-		var/datum/player_details/deets = GLOB.player_details[player.ckey]
-		if(deets)
-			body += deets.get_played_names()
+		if(player.persistent_client)
+			body += player.persistent_client.get_played_names()
 		else
 			body += "<i>None?!</i>"
 		body += "<br><br>"
@@ -196,7 +195,7 @@ ADMIN_VERB(respawn_character, R_ADMIN, "Respawn Character", "Respawn a player th
 				var/mob/living/carbon/human/species/monkey/new_monkey = new
 				SSjob.send_to_late_join(new_monkey)
 				G_found.mind.transfer_to(new_monkey) //be careful when doing stuff like this! I've already checked the mind isn't in use
-				new_monkey.key = G_found.key
+				new_monkey.PossessByPlayer(G_found.key)
 				to_chat(new_monkey, "You have been fully respawned. Enjoy the game.", confidential = TRUE)
 				var/msg = span_adminnotice("[key_name_admin(user)] has respawned [new_monkey.key] as a filthy monkey.")
 				message_admins(msg)
@@ -231,7 +230,7 @@ ADMIN_VERB(respawn_character, R_ADMIN, "Respawn Character", "Respawn a player th
 	if(is_unassigned_job(new_character.mind.assigned_role))
 		new_character.mind.set_assigned_role(SSjob.get_job_type(SSjob.overflow_role))
 
-	new_character.key = G_found.key
+	new_character.PossessByPlayer(G_found.key)
 
 	/*
 	The code below functions with the assumption that the mob is already a traitor if they have a special role.

code/modules/admin/verbs/debug.dm

@@ -167,7 +167,9 @@ ADMIN_VERB(cmd_assume_direct_control, R_ADMIN, "Assume Direct Control", "Assume
 	var/mob/adminmob = user.mob
 	if(M.ckey)
 		M.ghostize(FALSE)
-	M.key = user.key
+
+	M.PossessByPlayer(user.key)
+
 	user.init_verbs()
 	if(isobserver(adminmob))
 		qdel(adminmob)

code/modules/admin/verbs/ert.dm

@@ -174,7 +174,7 @@
 				var/chosen_outfit = usr.client?.prefs?.read_preference(/datum/preference/choiced/brief_outfit)
 				usr.client.prefs.safe_transfer_prefs_to(admin_officer, is_antag = TRUE)
 				admin_officer.equipOutfit(chosen_outfit)
-				admin_officer.key = usr.key
+				admin_officer.PossessByPlayer(usr.key)
 
 			else
 				to_chat(usr, span_warning("Could not spawn you in as briefing officer as you are not a ghost!"))
@@ -232,7 +232,7 @@
 			else
 				ert_operative = new /mob/living/carbon/human(spawnloc)
 				chosen_candidate.client.prefs.safe_transfer_prefs_to(ert_operative, is_antag = TRUE)
-			ert_operative.key = chosen_candidate.key
+			ert_operative.PossessByPlayer(chosen_candidate.key)
 
 			if(ertemplate.enforce_human || !(ert_operative.dna.species.changesource_flags & ERT_SPAWN))
 				ert_operative.set_species(/datum/species/human)

code/modules/admin/verbs/individual_logging.dm

@@ -48,10 +48,9 @@
 	dat += "<hr style='background:#000000; border:0; height:1px'>"
 
 	var/log_source = M.logging
-	if(source == LOGSRC_CKEY && M.ckey)
-		var/datum/player_details/details = GLOB.player_details[M.ckey]
-		if(details) //we dont want to runtime if an admin aghosted
-			log_source = details.logging
+	if(source == LOGSRC_CKEY && M.persistent_client)
+		log_source = M.persistent_client.logging
+
 	var/list/concatenated_logs = list()
 	for(var/log_type in log_source)
 		var/nlog_type = text2num(log_type)
@@ -59,6 +58,7 @@
 			var/list/all_the_entrys = log_source[log_type]
 			for(var/entry in all_the_entrys)
 				concatenated_logs += "<b>[entry]</b><br>[all_the_entrys[entry]]"
+
 	if(length(concatenated_logs))
 		sortTim(concatenated_logs, cmp = GLOBAL_PROC_REF(cmp_text_dsc)) //Sort by timestamp.
 		dat += "<font size=2px>"

code/modules/admin/verbs/secrets.dm

@@ -639,7 +639,7 @@ ADMIN_VERB(secrets, R_NONE, "Secrets", "Abuse harder than you ever have before w
 				chosen_candidate = pick(candidates)
 				candidates -= chosen_candidate
 				nerd = new /mob/living/basic/drone/classic(spawnpoint)
-				nerd.key = chosen_candidate.key
+				nerd.PossessByPlayer(chosen_candidate.key)
 				nerd.log_message("has been selected as a Nanotrasen emergency response drone.", LOG_GAME)
 				teamsize--
 
@@ -716,7 +716,7 @@ ADMIN_VERB(secrets, R_NONE, "Secrets", "Abuse harder than you ever have before w
 			var/mob/chosen = players[1]
 			if (chosen.client)
 				chosen.client.prefs.safe_transfer_prefs_to(spawnedMob, is_antag = TRUE)
-				spawnedMob.key = chosen.key
+				spawnedMob.PossessByPlayer(chosen.key)
 			players -= chosen
 		if (ishuman(spawnedMob) && ispath(humanoutfit, /datum/outfit))
 			var/mob/living/carbon/human/H = spawnedMob