Add scope to class entries

The idea here is to create something that can be used for other things
essentially making this quite flexible.

required scope: when defined, the class can only be used in the
                required scope, or its descendents when absolute is false
lexical scope: the scope the class is defined in -- either a namespace
               or another class.

Author: withinboredom

Zend/zend.h

@@ -164,6 +164,10 @@ struct _zend_class_entry {
 	HashTable properties_info;
 	HashTable constants_table;
 
+	zend_class_entry *required_scope;
+	zend_class_entry *lexical_scope;
+	bool required_scope_absolute;
+
 	ZEND_MAP_PTR_DEF(zend_class_mutable_data*, mutable_data);
 	zend_inheritance_cache_entry *inheritance_cache;