Add a virtual controller to merge Joy-Cons. #745

Job	Run time
pr_build / macOS Universal (Debug)	6m 21s
pr_build / win-x64 (Debug)	8m 34s
pr_build / macOS Universal (Release)	5m 55s
pr_build / linux-x64 (Debug)	5m 0s
pr_build / linux-arm64 (Debug)	3m 1s
pr_build / osx-x64 (Debug)	4m 55s
pr_build / win-x64 (Release)	7m 19s
pr_build / linux-x64 (Release)	4m 25s
pr_build / linux-arm64 (Release)	2m 54s
pr_build / osx-x64 (Release)	4m 5s
	52m 29s

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