- 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/Services/Impl/SoundCloudApiService.cs

@@ -7,9 +7,7 @@ public class SoundCloudApiService : INService
     private readonly IHttpClientFactory _httpFactory;
 
     public SoundCloudApiService(IHttpClientFactory factory)
-    {
-        _httpFactory = factory;
-    }
+        => _httpFactory = factory;
 
     public async Task<SoundCloudVideo> ResolveVideoAsync(string url)
     {