Making ini parser typed
- Added ZEND_INI_SCANNER_TYPED mode for parse_ini_string() and parse_ini_file()
- Added NULL_NULL token to separate it from BOOL_FALSE and BOOL_TRUE
- Added zend_ini_copy_typed_value() function for zval initialisation
- Updated RETURN_TOKEN() to observe scanner_mode
Added test case
Updated NEWS for #38409
Updated UPGRADING for #38409
Merge branch 'PHP-5.6'

* PHP-5.6:
  Updated UPGRADING for #38409
  Updated NEWS for #38409
  Added test case
  Making ini parser typed - Added ZEND_INI_SCANNER_TYPED mode for parse_ini_string() and parse_ini_file() - Added NULL_NULL token to separate it from BOOL_FALSE and BOOL_TRUE - Added zend_ini_copy_typed_value() function for zval initialisation - Updated RETURN_TOKEN() to observe scanner_mode

Conflicts:
	Zend/zend_ini_parser.y
	Zend/zend_ini_scanner.c
Updated NEWS for #38409
Updated UPGRADING for #38409
Fixed 'long' -> 'zend_long' for call to 'is_numeric_string_ex()'