Improve class entry generation

[kocsismate]

No description provided.

[kocsismate]

After making the functions static, the compiler could detect that register_class_ZendTestNS_Foo() and register_class_ZendTestNS_Foo2() are defined but not used. I think it should be a supported use-case not to use these functions, shouldn't it? Is there any possibility to circumvent the issue?

[nikic]

@kocsismate I don't think that should be a supported use-case. Why declare classes in the stub if they don't actually get declared?

[kocsismate]

@nikic After thinking about it a little bit, I realized that you are right. My initial idea was that the reason of not using a class entry generator function could be that it is missing a needed feature (e.g. gen_stub.php doesn't yet support generating properties with a union type of multiple classes, or with constant default values).

However, my argument was bad, since the missing features can be fixed up later manually (e.g. by declaring the missing properties after the ce registration). That said, I'll fix the issue by declaring the missing classes. :)

[kocsismate]

I'm currently working on adding support for generating properties with an union type of multiple classes.

[nikic]

Can you please land the first two commits to reduce the diff?