- 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/StandardConversions.cs

@@ -3,7 +3,5 @@
 public static class StandardConversions
 {
     public static double CelsiusToFahrenheit(double cel)
-    {
-        return (cel * 1.8f) + 32;
-    }
+        => (cel * 1.8f) + 32;
 }