Fix #3265

Fix for #3265
Added requirement for a crud-controller name to start with an uppercase letter and added hint about the recommended naming style (CamelCase).

If someone has a suggestion for a better regex, I'm open.
```regex
(^|\\\\)
```
is just a workaround if validation is not executed in the defined order (is it granted that validation is always executed in the order of definition?) to not to report a required uppercase error, if no fqn is given.