Add missing classes to stubs

Add support for union types for internal functions

This closes the last hole in the supported types for internal
function arginfo types. It's now possible to represent unions of
mult

Add support for union types for internal functions

This closes the last hole in the supported types for internal
function arginfo types. It's now possible to represent unions of
multiple classes. This is done by storing them as TypeA|TypeB and
PHP will then convert this into an appropriate union type list.

Closes GH-6581.

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Fix ffi stubs

Closes GH-6543.

Fix the signature of FFI::typeof() and FFI::memcmp()

Fix the signature of FFI::sizeof() and FFI::alignof()

Update ext/ffi parameter names

Closes GH-6282.

Declare FFI\CType in namespace

Now that it is supported, declare that CType is part of the FFI
namespace, not a freestanding class.

Added FFI\CType::getName() method

Add more precise type info for stubs

Closes GH-6005

Add all the missing parameter types to stubs

Closes GH-5955

Fix some UNKNOWN default values

In ext/ffi, ext/intl, ext/mysqli, and ext/pcntl

Fix UNKNOWN default values in various extensions

Closes GH-5514

Clarify that FFI::cdef() does not return NULL

Generate method entries from stubs for curl, ffi, pdo, phar

Closes GH-5375

Add missing visibility modifiers in stubs

Add return types to FFI methods

The FFI class is final, so we can use proper return types.

Add ext/ffi stubs