- More code cleanup and codestyle updates

- Fixed some possible nullref exceptions
- Methods signatures now have up to 3 parameters before breakaing down each parameter in a separate line
- Method invocations have the same rule, except the first parameter will be in the same line as the invocation to prevent some ugliness when passing lambas as arguments
- Applied many more codestyles
- Extensions folder fully reformatted

src/NadekoBot/Common/AsyncLazy.cs

@@ -12,5 +12,6 @@ public class AsyncLazy<T> : Lazy<Task<T>>
         base(() => Task.Run(taskFactory))
     { }
 
-    public TaskAwaiter<T> GetAwaiter() { return Value.GetAwaiter(); }
+    public TaskAwaiter<T> GetAwaiter()
+        => Value.GetAwaiter();
 }