Similar to what is done for ReflectionType itself, copy the
type name stored inside ReflectionProperty. Also make sure the
type field is always initialized for dynamic properties.

This is a non-issue in PHP 8, because we store a pointer to the
property_info there, rather than a copy.

`ReflectionClass` allows reading of the values of private and protected
constants, and also to get private and protected static methods.
Therefore getting the values of private and protected static properties
is also permissible, especially since `::getStaticProperties()` already
allows to do so.

We also allow ::setStaticPropertyValue() to modify private and
protected properties, because otherwise this method is useless, as
modifying public properties can be done directly.

When retrieving the static class properties via reflection, we have to
cater to possible modifications.

This reverts commit a895bb6885fbceea3e8375816969d5510d8d082e.

When retrieving the static class properties via reflection, we have to
cater to possible modifications.

Reset fake_scope during __toString() call.

I'll check if we can solve this more globally in master, by
resetting fake_scope in zend_call_function.

* PHP-7.3:
  Fixed bug #79062

Back up the doc comment when performing heredoc scanahead.