Add encodeLE/decodeLE, fixing #19 #41

Job	Run time
darwin_arm (self-hosted, macOS, ARM64, 8.10.7)	5m 59s
darwin_arm (self-hosted, macOS, ARM64, 9.2.8)	1s
emulated (s390x)	5m 47s
darwin_arm (self-hosted, macOS, ARM64, 9.4.7)	1s
arm (arm32v7)	5m 53s
emulated (ppc64le)	5m 43s
arm (arm64v8)	1s
build (ubuntu-latest, 8.6, 3.8.1.0)	5m 55s
build (ubuntu-latest, 8.8, 3.8.1.0)	5m 56s
freebsd (self-hosted, FreeBSD, X64, 9.4.8)	5m 53s
build (ubuntu-latest, 8.10, 3.8.1.0)	5m 56s
i386	5m 41s
freebsd (self-hosted, FreeBSD, X64, 9.6.4)	5m 52s
build (ubuntu-latest, 9.0, 3.8.1.0)	6m 1s
build (ubuntu-latest, 9.2, 3.8.1.0)	5m 56s
build (ubuntu-latest, 9.4, 3.8.1.0)	5m 55s
build (ubuntu-latest, 9.6, 3.8.1.0)	5m 55s
build (ubuntu-latest, 9.8, 3.8.1.0)	5m 54s
build (macOS-12, 9.4, 3.8.1.0)	5m 54s
build (macOS-12, 9.6, 3.8.1.0)	5m 56s
build (windows-latest, 9.4, 3.8.1.0)	5m 49s
build (windows-latest, 9.6, 3.8.1.0)	5m 48s
	1h 51m 46s

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