Fast base58 codec #2645

Job	Run time
dependencies (linux, gcc, Debug)	1m 14s
dependencies (linux, gcc, Release)	1m 14s
dependencies (linux, clang, Debug)	1m 14s
dependencies (linux, clang, Release)	1m 15s
coverage (linux, gcc, Debug)	14m 12s
test (linux, gcc, Debug)	11m 42s
test (linux, gcc, Debug, -Dunity=ON)	7m 2s
test (linux, gcc, Release)	14m 18s
test (linux, gcc, Release, -Dunity=ON)	8m 43s
test (linux, clang, Debug)	9m 29s
test (linux, clang, Debug, -Dunity=ON)	5m 32s
test (linux, clang, Release)	12m 38s
test (linux, clang, Release, -Dunity=ON)	8m 17s
	1h 36m 50s

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