- 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/LoginErrorHandler.cs

@@ -7,10 +7,8 @@ public class LoginErrorHandler
 {
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public static void Handle(Exception ex)
-    {
-        Log.Fatal(ex, "A fatal error has occurred while attempting to connect to Discord");
-    }
-        
+        => Log.Fatal(ex, "A fatal error has occurred while attempting to connect to Discord");
+
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public static void Handle(HttpException ex)
     {