- 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/Yml/Rgba32Converter.cs

@@ -9,9 +9,7 @@ namespace NadekoBot.Common.Yml;
 public class Rgba32Converter : IYamlTypeConverter
 {
     public bool Accepts(Type type)
-    {
-        return type == typeof(Rgba32);
-    }
+        => type == typeof(Rgba32);
 
     public object ReadYaml(IParser parser, Type type)
     {
@@ -31,9 +29,7 @@ public class Rgba32Converter : IYamlTypeConverter
 public class CultureInfoConverter : IYamlTypeConverter
 {
     public bool Accepts(Type type)
-    {
-        return type == typeof(CultureInfo);
-    }
+        => type == typeof(CultureInfo);
 
     public object ReadYaml(IParser parser, Type type)
     {