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Add linked_map key traits #74

Job	Run time
docs	21s
windows-clang-cl static	1m 36s
macos no-exceptions	54s
windows-mingw no-exceptions	2m 30s
windows-clang-cl release	1m 41s
windows-clang-cl shared	1m 41s
windows-msvc no-exceptions	1m 27s
windows-msvc static	2m 6s
windows-mingw shared	2m 11s
linux-gcc no-exceptions	1m 8s
windows-mingw static	2m 34s
linux-clang shared	1m 8s
windows-clang-cl no-exceptions	1m 38s
linux-clang static	1m 15s
macos shared	46s
linux-gcc static	1m 12s
macos static	1m 15s
macos release	1m 21s
linux-clang release	7m 1s
linux-gcc release	1m 41s
windows-msvc shared	1m 20s
windows-msvc release	2m 0s
linux-gcc shared	1m 10s
	39m 56s