New stuff for objects API:
- Better assignment handling
- More flexible operations with zval-containing objects

Mega-commit: Enter the new object model
Note: only standard Zend objects are working now. This is definitely going to
break custom objects like COM, Java, etc. - this will be fixed later.

Mega-commit: Enter the new object model
Note: only standard Zend objects are working now. This is definitely going to
break custom objects like COM, Java, etc. - this will be fixed later.
Also, this may break other things that access objects' internals directly.

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