Add encodeLE/decodeLE, fixing #19 #38

Job	Run time
emulated (s390x)	30m 45s
arm (arm32v7)	9m 19s
darwin_arm (self-hosted, macOS, ARM64, 8.10.7)	25m 46s
emulated (ppc64le)	19m 13s
arm (arm64v8)	8m 32s
darwin_arm (self-hosted, macOS, ARM64, 9.2.8)	20m 22s
build (ubuntu-latest, 8.6, 3.8.1.0)	10m 52s
darwin_arm (self-hosted, macOS, ARM64, 9.4.7)	24m 26s
build (ubuntu-latest, 8.8, 3.8.1.0)	47m 57s
freebsd (self-hosted, FreeBSD, X64, 9.4.8)	7m 53s
build (ubuntu-latest, 8.10, 3.8.1.0)	10m 5s
i386	10m 51s
freebsd (self-hosted, FreeBSD, X64, 9.6.4)	5m 56s
build (ubuntu-latest, 9.0, 3.8.1.0)	10m 59s
build (ubuntu-latest, 9.2, 3.8.1.0)	16m 49s
build (ubuntu-latest, 9.4, 3.8.1.0)	10m 26s
build (ubuntu-latest, 9.6, 3.8.1.0)	9m 34s
build (ubuntu-latest, 9.8, 3.8.1.0)	7m 44s
build (macOS-12, 9.4, 3.8.1.0)	42m 37s
build (macOS-12, 9.6, 3.8.1.0)	30m 11s
build (windows-latest, 9.4, 3.8.1.0)	44m 22s
build (windows-latest, 9.6, 3.8.1.0)	49m 32s
	7h 34m 11s

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