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

src/NadekoBot/Modules/Nsfw/_Common/DerpiContainer.cs

@@ -0,0 +1,21 @@
+#nullable disable
+using System.Text.Json.Serialization;
+
+namespace NadekoBot.Modules.Nsfw.Common;
+
+public class DerpiContainer
+{
+    public DerpiImageObject[] Images { get; set; }
+}
+
+public class DerpiImageObject : IImageData
+{
+    [JsonPropertyName("view_url")]
+    public string ViewUrl { get; set; }
+
+    public string[] Tags { get; set; }
+    public int Score { get; set; }
+
+    public ImageData ToCachedImageData(Booru type)
+        => new(ViewUrl, type, Tags, Score.ToString("F1"));
+}