Unicode awareness Part 2 -- copytext() (#48512)

* Unicode support Part 2 -- copytext()

This is the transition of all copytext() calls to be unicode aware and also some nearby calls in the same functions. Most things are just replacing copytext() with copytext_char() as a terrible character limiter but a few others were slightly more involved.

I replaced a ton of
````
var/something = sanitize(input())
something = copytext(something, 1, MAX_MESSAGE_LEN)
````

with a single stripped_input() call. stripped_input() already calls html_encode(), trim(), and some other sanitization so there shouldn't be any major issues there.

This is still VERY rough btw; DNA is a mess, the status displays are complete ass, there's a copytext() in code\datums\shuttles.dm that I'm not sure what to do with, and I didn't touch anything in the tools folder. I haven't tested this much at all yet, I only got it to compile earlier this morning. There's also likely to be weird bugs until I get around to fixing length(), findtext(), and the rest of the string procs.

* Makes the code functional

* Assume color hex strings are always # followed by ascii.
Properly encodes and decodes the stuff in mob_helpers.dm which fixes some issues there.

* Removes ninjaspeak since it's unused

code/game/objects/structures/mirror.dm

@@ -136,8 +136,7 @@
 
 	switch(choice)
 		if("name")
-			var/newname = copytext(sanitize_name(reject_bad_text(input(H, "Who are we again?", "Name change", H.name) as null|text)),1,MAX_NAME_LEN)
-
+			var/newname = sanitize_name(reject_bad_text(stripped_input(H, "Who are we again?", "Name change", H.name, MAX_NAME_LEN)))
 			if(!newname)
 				return
 			if(!user.canUseTopic(src, BE_CLOSE, FALSE, NO_TK))

code/game/objects/structures/musician.dm

@@ -112,8 +112,10 @@
 					var/cur_note = text2ascii(note) - 96
 					if(cur_note < 1 || cur_note > 7)
 						continue
-					for(var/i=2 to length(note))
-						var/ni = copytext(note,i,i+1)
+					var/notelen = length(note)
+					var/ni = ""
+					for(var/i = length(note[1]) + 1, i <= notelen, i += length(ni))
+						ni = note[i]
 						if(!text2num(ni))
 							if(ni == "#" || ni == "b" || ni == "n")
 								cur_acc[cur_note] = ni
@@ -202,9 +204,10 @@
 	//split into lines
 	lines = splittext(text, "\n")
 	if(lines.len)
-		if(copytext(lines[1],1,6) == "BPM: ")
-			tempo = sanitize_tempo(600 / text2num(copytext(lines[1],6)))
-			lines.Cut(1,2)
+		var/bpm_string = "BPM: "
+		if(findtext(lines[1], bpm_string, 1, length(bpm_string) + 1))
+			tempo = sanitize_tempo(600 / text2num(copytext(lines[1], length(bpm_string) + 1)))
+			lines.Cut(1, 2)
 		else
 			tempo = sanitize_tempo(5) // default 120 BPM
 		if(lines.len > MUSIC_MAXLINES)
@@ -212,7 +215,7 @@
 			lines.Cut(MUSIC_MAXLINES + 1)
 		var/linenum = 1
 		for(var/l in lines)
-			if(length(l) > MUSIC_MAXLINECHARS)
+			if(length_char(l) > MUSIC_MAXLINECHARS)
 				to_chat(usr, "Line [linenum] too long!")
 				lines.Remove(l)
 			else
@@ -276,8 +279,8 @@
 			return
 		if(lines.len > MUSIC_MAXLINES)
 			return
-		if(length(newline) > MUSIC_MAXLINECHARS)
-			newline = copytext(newline, 1, MUSIC_MAXLINECHARS)
+		if(length_char(newline) > MUSIC_MAXLINECHARS)
+			newline = copytext_char(newline, 1, MUSIC_MAXLINECHARS)
 		lines.Add(newline)
 
 	else if(href_list["deleteline"])
@@ -288,11 +291,9 @@
 
 	else if(href_list["modifyline"])
 		var/num = round(text2num(href_list["modifyline"]),1)
-		var/content = html_encode(input("Enter your line: ", instrumentObj.name, lines[num]) as text|null)
+		var/content = stripped_input(usr, "Enter your line: ", instrumentObj.name, lines[num], MUSIC_MAXLINECHARS)
 		if(!content || !usr.canUseTopic(instrumentObj, BE_CLOSE, FALSE, NO_TK))
 			return
-		if(length(content) > MUSIC_MAXLINECHARS)
-			content = copytext(content, 1, MUSIC_MAXLINECHARS)
 		if(num > lines.len || num < 1)
 			return
 		lines[num] = content