- 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/Nsfw/SearchImageCacher.cs

@@ -68,6 +68,7 @@ public class SearchImageCacher : INService
                     .Distinct()
                     .Shuffle()
                     .Take(50)
+                    .ToList()
                     .ForEach(x => typeUsedTags.Add(x));
 
             foreach (var img in images)