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Introduce TypeTag<T> template whose int value differs for each T.
This replaces type_tag<T>(), which searched and possibly extended the type_tags unordered_map at runtime. If we called lua_emplace<T>() from different threads, that would require locking type_tags. In contrast, the compiler must instantiate a distinct TypeTag<T> for every distinct T passed to lua_emplace<T>(), so each gets a distinct value at static initialization time. No locking is required; no lookup; no allocations. Add a test to llluamanager_test.cpp to verify that each distinct T passed to lua_emplace<T>() gets its own TypeTag<T>::value, and that each gets its own destructor -- but that different lua_emplace<T>() calls with the same T share the same TypeTag<T>::value and the same destructor.
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