Add support for combination of incomplete dispatch #58
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In continuous delivery of a large system, it is sometimes useful to allow some polymorphic component in "not implemented" state. It is supported in the virtual mechanism of C++ by defining a body of a virtual function, but not currently supported in the
proxylibrary. This change improves the semantics ofPRO_DEF_COMBINED_DISPATCHto allow combination of incomplete dispatches, such as a "not implemented" closure, without requiringoverload_typesto present.This change also bypasses #56.