ARMeilleure: replace else-ifs with switch statements #152

Job	Run time
pr_build / win-x64 (Debug)	7m 58s
pr_build / macOS Universal (Debug)	5m 49s
pr_build / linux-x64 (Debug)	4m 34s
pr_build / linux-arm64 (Debug)	2m 32s
pr_build / macOS Universal (Release)	6m 2s
pr_build / osx-x64 (Debug)	8m 7s
pr_build / win-x64 (Release)	7m 55s
pr_build / linux-x64 (Release)	3m 54s
pr_build / linux-arm64 (Release)	2m 18s
pr_build / osx-x64 (Release)	7m 55s
	57m 4s

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