Initial split of the modules

NadekoBot.Modules.Music/Common/Exceptions/NotInVoiceChannelException.cs

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+using System;
+
+namespace NadekoBot.Modules.Music.Common.Exceptions
+{
+    public class NotInVoiceChannelException : Exception
+    {
+        public NotInVoiceChannelException() : base("You're not in the voice channel on this server.") { }
+    }
+}

NadekoBot.Modules.Music/Common/Exceptions/QueueFullException.cs

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+using System;
+
+namespace NadekoBot.Modules.Music.Common.Exceptions
+{
+    public class QueueFullException : Exception
+    {
+        public QueueFullException(string message) : base(message)
+        {
+        }
+        public QueueFullException() : base("Queue is full.") { }
+    }
+}

NadekoBot.Modules.Music/Common/Exceptions/SongNotFoundException.cs

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+using System;
+
+namespace NadekoBot.Modules.Music.Common.Exceptions
+{
+    public class SongNotFoundException : Exception
+    {
+        public SongNotFoundException(string message) : base(message)
+        {
+        }
+        public SongNotFoundException() : base("Song is not found.") { }
+    }
+}