Fixed collecting of inherited private properties, Fixed references counting for "r" and "R"

Before this fix private properties of descendants collected "as is" with NUL characters.
After this fix such properties has format "ParentClass::propertyName".

Public, protected and own private properties are not affected by this fix.

Any value can be referenced by "R", not only array and object (reference operator in PHP). But "R" itself is not encounted, as a value for reference. And "r" is just a link to object. Also "r" can be referenced by "R".