Bring back needsVoices, add vocalsSuffix in meta

source/funkin/backend/chart/Chart.hx

@@ -121,6 +121,8 @@ class Chart {
 		data.setFieldDefault("coopAllowed", Flags.DEFAULT_COOP_ALLOWED);
 		data.setFieldDefault("opponentModeAllowed", Flags.DEFAULT_OPPONENT_MODE_ALLOWED);
 		data.setFieldDefault("instSuffix", "");
+		data.setFieldDefault("vocalsSuffix", "");
+		data.setFieldDefault("needsVoices", true);
 
 		if (data.difficulties.length <= 0) {
 			data.difficulties = [for(f in Paths.getFolderContent('songs/${songName}/charts/', false, fromMods ? MODS : SOURCE)) if (Path.extension(f.toUpperCase()) == "JSON") Path.withoutExtension(f)];

source/funkin/backend/chart/ChartData.hx

@@ -30,6 +30,8 @@ typedef ChartMetaData = {
 	public var ?customValues:Dynamic;
 	public var ?metas:Map<String, ChartMetaData>;
 	public var ?instSuffix:String;
+	public var ?vocalsSuffix:String;
+	public var ?needsVoices:Bool;
 }
 
 typedef ChartStrumLine = {

source/funkin/backend/chart/FNFLegacyParser.hx

@@ -40,6 +40,7 @@ class FNFLegacyParser {
 		}
 
 		result.meta.bpm = data.bpm;
+		result.meta.needsVoices = data.needsVoices.getDefault(true);
 
 		var camFocusedBF:Bool = false;
 		var altAnims:Bool = false;
@@ -156,7 +157,7 @@ class FNFLegacyParser {
 			notes: null,
 			bpm: chart.meta.bpm,
 			speed: chart.scrollSpeed,
-			needsVoices: true,
+			needsVoices: chart.meta.needsVoices,
 
 			player1: null,
 			player2: null,

source/funkin/backend/chart/VSliceParser.hx

@@ -67,6 +67,7 @@ class VSliceParser {
 
 		var timeChanges = metadata.timeChanges;
 		result.meta.bpm = timeChanges[0].bpm;
+		result.meta.needsVoices = false;
 
 		for (note in data)
 		{