Allows easy hosting of server side lobby music (#31352)

* Allows easy hosting of server side lobby music

* No images here!!!

* Undelete /tg/ sounds... REEE

* Add back the old system and use it if this doesn't find any music

* Documentation++

* Update round_start_sounds.txt

* Allow for rare map specific title music

Also don't attempt to play non-valid sounds/non-sounds

* Fix bad sound filter, fix common sounds

* Update README.txt

* Update ticker.dm

* Update ticker.dm

code/controllers/subsystem/ticker.dm

@@ -68,10 +68,57 @@ SUBSYSTEM_DEF(ticker)
 
 /datum/controller/subsystem/ticker/Initialize(timeofday)
 	load_mode()
-	var/list/music = world.file2list(ROUND_START_MUSIC_LIST, "\n")
+
+	var/list/byond_sound_formats = list(
+		"mid"  = TRUE,
+		"midi" = TRUE,
+		"mod"  = TRUE,
+		"it"   = TRUE,
+		"s3m"  = TRUE,
+		"xm"   = TRUE,
+		"oxm"  = TRUE,
+		"wav"  = TRUE,
+		"ogg"  = TRUE,
+		"raw"  = TRUE,
+		"wma"  = TRUE,
+		"aiff" = TRUE
+	)
+
+	var/list/provisional_title_music = flist("config/title_music/sounds/")
+	var/list/music = list()
+	var/use_rare_music = prob(1)
+
+	for(var/S in provisional_title_music)
+		var/lower = lowertext(S)
+		var/list/L = splittext(lower,"+")
+		switch(L.len)
+			if(3) //rare+MAP+sound.ogg or MAP+rare.sound.ogg -- Rare Map-specific sounds
+				if(use_rare_music)
+					if(L[1] == "rare" && L[2] == SSmapping.config.map_name)
+						music += S
+					else if(L[2] == "rare" && L[1] == SSmapping.config.map_name)
+						music += S
+			if(2) //rare+sound.ogg or MAP+sound.ogg -- Rare sounds or Map-specific sounds
+				if((use_rare_music && L[1] == "rare") || (L[1] == SSmapping.config.map_name))
+					music += S
+			if(1) //sound.ogg -- common sound
+				music += S
+
 	var/old_login_music = trim(file2text("data/last_round_lobby_music.txt"))
 	if(music.len > 1)
 		music -= old_login_music
+
+	for(var/S in music)
+		var/list/L = splittext(S,".")
+		if(L.len >= 2)
+			var/ext = lowertext(L[L.len]) //pick the real extension, no 'honk.ogg.exe' nonsense here
+			if(byond_sound_formats[ext])
+				continue
+		music -= S
+
+	if(isemptylist(music))
+		music = world.file2list(ROUND_START_MUSIC_LIST, "\n")
+
 	login_music = pick(music)
 
 	if(!GLOB.syndicate_code_phrase)

config/title_music/LICENSE.txt

@@ -0,0 +1,34 @@
+---LICENSE NOTICE---
+
+The server operator(s) is responsible for the copyright status of all sounds placed within the /config/title_music/sounds folder unless otherwise noted.
+
+If a sound requires attribution and/or a specific license it is up to the operator(s) to make this information publicly available on either 
+a website associated with their server or on the server itself. 
+
+If operators(s) allow these configuration files to be public this file can serve that purpose by keeping it properly updated.
+
+If in the future new sounds are published to these folders (i.e. in an online code repository) they must explicitly state their 
+license if said license is not the same as the default licensing found in README.md in the root directory of the project.
+
+Do not remove this notice.
+
+---END NOTICE---
+
+
+
+
+---EXAMPLES (NOT PART OF ANY LICENSE)---
+
+These are examples of properly attrubuted and licensed sounds. 
+They are not an actual part of any license under any circumstance.
+
+title5.ogg was created by Mya Quinn on Feburary 28, 2557. It is licensed under a Combative Clowning 3.0 HO-NK license (http://example.com/license/url/). 
+
+Unless otherwise noted all sounds were created by Cuban Pete on July 26, 2555. They are licensed under the RUMBABEAT Public License.(http://example.com/license/url/).
+
+---END EXAMPLES (NOT PART OF ANY LICENSE)---
+
+
+
+
+---ADD LICENSING INFORMATION BELOW---

config/title_music/README.txt

@@ -0,0 +1,39 @@
+The enclosed sounds folder holds the sound files used as the title music for the game. OGG and WAV are supported.
+
+Using unnecessarily huge sounds can cause client side lag and should be avoided.
+
+You may add as many title sounds as you like, if there is more than one a random screen is chosen (see name conventions for specifics).
+
+---
+
+Naming Conventions:
+
+Every title sound you add must have a unique name. It is allowed to name two things the same if they have different file types, but this should be discouraged.
+Avoid using the plus sign "+" and the period "." in names, as these are used internally to classify sounds.
+
+
+Common Title Sounds:
+
+Common sounds are in the rotation to be displayed all the time. Any name that does not include the character "+" is considered a common sound.
+
+An example of a common sound name is "clown".
+
+
+Map Title Sounds:
+
+Map sounds are tied to a specific in game map. To make a map title you format the name like this "(name of a map)+(name of your sound)"
+
+The spelling of the map name is important. It must match exactly the define MAP_NAME found in the relevant .DM file in the /_maps folder in 
+the root directory. It can also be seen in game in the status menu. Note that there are no spaces between the two names.
+
+It is absolutely fine to have more than one sound tied to the same map. It's also fine to have a rare map sound.
+
+An example of a map sound name is "Omegastation+splash".
+
+
+Rare Title Sounds:
+
+Rare title sounds are a just for fun feature where they will only have a 1% chance of appear in in the title sound pool of a given round.
+Add the phrase "rare+" to the beginning of the name. Again note there are no spaces.
+
+An example of a rare sound name is "rare+explosion"