Add scrolling on-screen menu rails #913

Job	Run time
build	8m 38s
gbc-hw-tests (shard 2/2)	1m 34s
gbc-hw-tests (shard 1/2)	1m 30s
Integration tests (Acid2)	32s
Integration tests (CasualPokePlayer)	41s
Integration tests (Blargg individual)	1m 54s
Integration tests (Gambatte HWTests)	1m 48s
Integration tests (Blargg aggregate)	1m 27s
Integration tests (Strikethrough)	25s
Integration tests (Compatibility ROMs)	2m 4s
Integration tests (GBMicrotest)	42s
Integration tests (Mealybug Tearoom)	1m 8s
Integration tests (Mooneye)	1m 20s
Integration tests (CGB-ACID-HELL)	35s
Integration tests (Misc.-GB-Tests)	30s
	24m 48s

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