Bools and returns super-pr (#53221)

Replaces like 70-80% of 0 and such, as a side effect cleaned up a bunch of returns
Edit: Most left out ones are in mecha which should be done in mecha refactor already
Oh my look how clean it is

Co-authored-by: TiviPlus <TiviPlus>
Co-authored-by: Couls <coul422@gmail.com>

code/modules/client/client_procs.dm

@@ -125,8 +125,8 @@ GLOBAL_LIST_INIT(blacklisted_builds, list(
 /client/proc/is_content_unlocked()
 	if(!prefs.unlock_content)
 		to_chat(src, "Become a BYOND member to access member-perks and features, as well as support the engine that makes this game possible. Only 10 bucks for 3 months! <a href=\"https://secure.byond.com/membership\">Click Here to find out more</a>.")
-		return 0
-	return 1
+		return FALSE
+	return TRUE
 /*
  * Call back proc that should be checked in all paths where a client can send messages
  *
@@ -157,11 +157,11 @@ GLOBAL_LIST_INIT(blacklisted_builds, list(
 		total_message_count = 0
 		total_count_reset = 0
 		cmd_admin_mute(src, mute_type, 1)
-		return 1
+		return TRUE
 
 	//Otherwise just supress the message
 	else if(cache >= SPAM_TRIGGER_AUTOMUTE)
-		return 1
+		return TRUE
 
 
 	if(CONFIG_GET(flag/automute_on) && !holder && last_message == message)
@@ -169,21 +169,21 @@ GLOBAL_LIST_INIT(blacklisted_builds, list(
 		if(src.last_message_count >= SPAM_TRIGGER_AUTOMUTE)
 			to_chat(src, "<span class='danger'>You have exceeded the spam filter limit for identical messages. An auto-mute was applied.</span>")
 			cmd_admin_mute(src, mute_type, 1)
-			return 1
+			return TRUE
 		if(src.last_message_count >= SPAM_TRIGGER_WARNING)
 			to_chat(src, "<span class='danger'>You are nearing the spam filter limit for identical messages.</span>")
-			return 0
+			return FALSE
 	else
 		last_message = message
 		src.last_message_count = 0
-		return 0
+		return FALSE
 
 //This stops files larger than UPLOAD_LIMIT being sent from client to server via input(), client.Import() etc.
 /client/AllowUpload(filename, filelength)
 	if(filelength > UPLOAD_LIMIT)
 		to_chat(src, "<font color='red'>Error: AllowUpload(): File Upload too large. Upload Limit: [UPLOAD_LIMIT/1024]KiB.</font>")
-		return 0
-	return 1
+		return FALSE
+	return TRUE
 
 
 	///////////
@@ -333,7 +333,7 @@ GLOBAL_LIST_INIT(blacklisted_builds, list(
 			to_chat(src, "Because you are an admin, you are being allowed to walk past this limitation, But it is still STRONGLY suggested you upgrade")
 		else
 			qdel(src)
-			return 0
+			return
 	else if (byond_version < cwv)	//We have words for this client.
 		if(CONFIG_GET(flag/client_warn_popup))
 			var/msg = "<b>Your version of byond may be getting out of date:</b><br>"
@@ -353,11 +353,11 @@ GLOBAL_LIST_INIT(blacklisted_builds, list(
 		if (!CONFIG_GET(flag/allow_webclient))
 			to_chat(src, "Web client is disabled")
 			qdel(src)
-			return 0
+			return
 		if (CONFIG_GET(flag/webclient_only_byond_members) && !IsByondMember())
 			to_chat(src, "Sorry, but the web client is restricted to byond members only.")
 			qdel(src)
-			return 0
+			return
 
 	if( (world.address == address || !address) && !GLOB.host )
 		GLOB.host = key

code/modules/client/verbs/suicide.dm

@@ -1,4 +1,4 @@
-/mob/var/suiciding = 0
+/mob/var/suiciding = FALSE
 
 /mob/proc/set_suicide(suicide_state)
 	suiciding = suicide_state
@@ -22,7 +22,7 @@
 			mmi.brainmob.suiciding = suicide_state
 
 /mob/living/carbon/human/verb/suicide()
-	set hidden = 1
+	set hidden = TRUE
 	if(!canSuicide())
 		return
 	var/oldkey = ckey