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Replace boost::unordered_map, boost::unordered_set with std::unordered_map, std…

Description

Replace boost::unordered_map, boost::unordered_set with std::unordered_map, std::unordered_set to establish consistency.

Replace boost::hash_combine with a lib/hash.h hash_combine performing the same statement.
Replace inconspicuous global boost hash_value specializations with std::hash specializations.
No performance difference was observed in three simple MeshManager measurements.

Remove unused TAG_MASK and h_tag in h_mgr.cpp following rP9961.
Replace typedef with using keyword and sort header includes.

Differential Revision: https://code.wildfiregames.com/D2441
Tested on: clang 9.0.0, gcc 9.2.0, Jenkins/vs2015, Jenkins/gcc6