- 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/Modules/Administration/AutoAssignRoleCommands.cs

@@ -61,7 +61,7 @@ public partial class Administration
 
             await ReplyConfirmLocalizedAsync(strs.aar_roles(
                 '\n' + existing.Select(x => Format.Bold(x.ToString()))
-                    .JoinWith(",\n")));
+                    .Join(",\n")));
         }
     }
 }