Add php keywords

[zonuexe]

This list contained keywords that are not PHP reserved words today.

I propose adding the following keywords:

• Keywords and compile-time constants
• Type name for type declaration
• Frequently mentioned classes/interfaces in code among Predefined Classes

[minad]

Thanks! Can you please propose the same addition to Company, even if you don't use Company? It would be better to keep these backends in sync.

See: https://github.com/minad/cape/blob/51b9bf1276445faebfbad636d9b6a39dc57b22bc/cape.el#L79-L80

cc @dgutov

[zonuexe]

@minad Thank you. I submitted same PR to https://github.com/company-mode/company-mode/pull/1311.

[minad]

Thanks!