zend_test: test ZPP specifiers

[Girgias]

Move ZPP tests from Zend/ to zend_test/ and add tests for the bool/int/float/number ZPP specifiers.

We don't test ZPP in normal functional tests, but it should still be tested somewhere.

Obviously there are many specifiers meaning:

• string (including "path" which tests for null bytes)
• the array variations
• the object variations
• resource
• functions
• enum
• the different unions (array|object, object|class-string, object|int, array|string, strint|int)

[arnaud-lb]

IMHO we shouldn't have tests at all in ext/zend_test, unless they are testing the extension itself. That's usually not the case: We call functions of ext/zend_test for the purpose of testing something else.

[arnaud-lb]

Please print something between each loop, and maybe before each try/catch block below, so that we can identify what the output relates to. This helps a lot when debugging a regression, or just when reviewing the test.