Cleanup (1-st round)

Fix ZTS build

This only makes it compile, it doesn't actually work, presumably
because interned strings are assumed in some places.

Various VM optimizations

Refactored ZVAL flags usage to simplify various checks (e.g. Z_REFCOUNTED(), candidate for GC, etc)

Avoid unnecessry reallocations

Refactored data structures to keep zend_object* instead of a whole zval in some places

Refactor session (incompleted)

Refactored IS_INDIRECT usage for CV and object properties to support HashTable resizing

Refactored EG(active_symbol_table) to be zend_array* instead of HashTable*

Fixed reference support

Fixed refcounted

Fixied calling object closures from internal functions

Changes zend_is_callable() to use zend_string* instead of char*

Fixed exception constructor

Refacting smart_str

Add __debugInfo() magic method

class Foo {
private $val = 'Random, meaningless data';

public function count() { return 42; }

public function __debugInfo() {

Add __debugInfo() magic method

class Foo {
private $val = 'Random, meaningless data';

public function count() { return 42; }

public function __debugInfo() {
return ['count' => $this->count()];
}
}

$f = new Foo;
var_dump($f);

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Use better data structures (incomplete)

Use better data structures (incomplete)

Use better data structures (incomplete)

Use better data structures (incomplete)

Use better data structures (incomplete)

Use better data structures (incomplete)

Add ZEND_ARG_CALLABLE_INFO to allow internal function to type hint against callable.

Bump year

Bump year