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

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

@@ -0,0 +1,15 @@
+#nullable disable
+namespace NadekoBot.Modules.Nsfw.Common;
+
+public enum Booru
+{
+    Safebooru,
+    E621,
+    Derpibooru,
+    Rule34,
+    Gelbooru,
+    Konachan,
+    Yandere,
+    Danbooru,
+    Sankaku
+}