Added and applied styles for private readonly fields, private fields to Extensions and Common folders.

- Some renamings and code cleanups
- Chained method calls, binary expressions and binary patterns will now break into newlines
- Type param constraints and base constructor calls will be on the new line

src/NadekoBot/Common/ModuleBehaviors/IInputTransformer.cs

@@ -0,0 +1,10 @@
+namespace NadekoBot.Common.ModuleBehaviors;
+
+public interface IInputTransformer
+{
+    Task<string> TransformInput(
+        IGuild guild,
+        IMessageChannel channel,
+        IUser user,
+        string input);
+}