Add encodeLE/decodeLE, fixing #19 #43

Job	Run time
emulated (s390x)	23m 42s
arm (arm32v7)	9m 14s
emulated (ppc64le)	18m 56s
build (ubuntu-latest, 8.6, 3.8.1.0)	11m 10s
arm (arm64v8)	8m 38s
darwin_arm (self-hosted, macOS, ARM64, 8.10.7)	6h 0m 17s
build (ubuntu-latest, 8.8, 3.8.1.0)	9m 57s
darwin_arm (self-hosted, macOS, ARM64, 9.2.8)	20m 22s
build (ubuntu-latest, 8.10, 3.8.1.0)	11m 18s
freebsd (self-hosted, FreeBSD, X64, 9.4.8)	6m 15s
darwin_arm (self-hosted, macOS, ARM64, 9.4.7)	22m 40s
i386	9m 18s
build (ubuntu-latest, 9.0, 3.8.1.0)	12m 52s
freebsd (self-hosted, FreeBSD, X64, 9.6.4)	6m 16s
build (ubuntu-latest, 9.2, 3.8.1.0)	26m 23s
build (ubuntu-latest, 9.4, 3.8.1.0)	15m 43s
build (ubuntu-latest, 9.6, 3.8.1.0)	10m 25s
build (ubuntu-latest, 9.8, 3.8.1.0)	9m 19s
build (macOS-12, 9.4, 3.8.1.0)	1h 7m 28s
build (macOS-12, 9.6, 3.8.1.0)	39m 49s
build (windows-latest, 9.4, 3.8.1.0)	58m 40s
build (windows-latest, 9.6, 3.8.1.0)	57m 12s
	13h 35m 54s

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