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

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

@@ -0,0 +1,22 @@
+namespace NadekoBot.Modules.Music;
+
+public interface IMusicQueue
+{
+    int Index { get; }
+    int Count { get; }
+    IQueuedTrackInfo Enqueue(ITrackInfo trackInfo, string queuer, out int index);
+    IQueuedTrackInfo EnqueueNext(ITrackInfo song, string queuer, out int index);
+
+    void EnqueueMany(IEnumerable<ITrackInfo> tracks, string queuer);
+
+    public IReadOnlyCollection<IQueuedTrackInfo> List();
+    IQueuedTrackInfo? GetCurrent(out int index);
+    void Advance();
+    void Clear();
+    bool SetIndex(int index);
+    bool TryRemoveAt(int index, out IQueuedTrackInfo? trackInfo, out bool isCurrent);
+    void RemoveCurrent();
+    IQueuedTrackInfo? MoveTrack(int from, int to);
+    void Shuffle(Random rng);
+    bool IsLast();
+}