Feature: check for usage of reserved names

[reitzmichnicht]

trafficstars

It would be great if a rule exists that prevents that the generated code for a specific programming language is invalid because of the use of reserved names for fields.

I had a field named "default" which produces errors when generating code for c/c++

[yoheimuta]

@reitzmichnicht Thank you for your nice suggestion. I agree with you that it's fairly useful.