Fixed some crashes in response strings source generator, reorganized more submodules into their folders

src/NadekoBot/Modules/Music/_Common/IVoiceProxy.cs

@@ -0,0 +1,15 @@
+#nullable disable
+using Ayu.Discord.Voice;
+
+namespace NadekoBot.Modules.Music;
+
+public interface IVoiceProxy
+{
+    VoiceProxy.VoiceProxyState State { get; }
+    public bool SendPcmFrame(VoiceClient vc, Span<byte> data, int length);
+    public void SetGateway(VoiceGateway gateway);
+    Task StartSpeakingAsync();
+    Task StopSpeakingAsync();
+    public Task StartGateway();
+    Task StopGateway();
+}