Add encodeLE/decodeLE, fixing #19 #42

Job	Run time
darwin_arm (self-hosted, macOS, ARM64, 8.10.7)	26m 52s
build (ubuntu-latest, 8.6, 3.8.1.0)	10m 28s
darwin_arm (self-hosted, macOS, ARM64, 9.2.8)	20m 31s
arm (arm32v7)	9m 31s
emulated (s390x)	22m 47s
build (ubuntu-latest, 8.8, 3.8.1.0)	9m 46s
arm (arm64v8)	8m 30s
emulated (ppc64le)	19m 0s
darwin_arm (self-hosted, macOS, ARM64, 9.4.7)	6h 0m 17s
build (ubuntu-latest, 8.10, 3.8.1.0)	10m 50s
build (ubuntu-latest, 9.0, 3.8.1.0)	10m 16s
freebsd (self-hosted, FreeBSD, X64, 9.4.8)	6m 7s
i386	9m 9s
build (ubuntu-latest, 9.2, 3.8.1.0)	8m 40s
freebsd (self-hosted, FreeBSD, X64, 9.6.4)	2h 29m 32s
build (ubuntu-latest, 9.4, 3.8.1.0)	12m 59s
build (ubuntu-latest, 9.6, 3.8.1.0)	10m 9s
build (ubuntu-latest, 9.8, 3.8.1.0)	8m 34s
build (macOS-12, 9.4, 3.8.1.0)	33m 15s
build (macOS-12, 9.6, 3.8.1.0)	1h 14m 7s
build (windows-latest, 9.4, 3.8.1.0)	1h 4m 23s
build (windows-latest, 9.6, 3.8.1.0)	51m 1s
	15h 36m 44s

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