major class system revision: Support :instanceof(), dedicated ctor() methods and construction using the Class() idiom

 * Class:instanceof() deprecates several fields like is_azipstream;
   is_a_stream is still useful
 * Constructors are now defined as ordinary methods (looks better)
 * every object and class table now has a `base` field that points to the
   base class since getmetatable() will no longer point to the base table/class.
 * Objects can be constructed both using Class:new() and Class().
   The old behaviour of stream() for serialization is used less frequently.
 * Streams can be serialized using the Stream:eval() method.
   I don't think that the object system should be tweaked even more to support
   different metamethods for class tables and objects as it is quite convoluted already.

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