Add `VisualLines` newtype wrapper #803

Job	Run time
msrv	1m 19s
lint	19s
cross (armv5te-unknown-linux-gnueabi)	38s
audit	16s
test (ubuntu-latest, stable, --all-features)	25s
test (macos-latest, stable, --all-features)	39s
test (windows-latest, stable, --all-features)	2m 16s
test (ubuntu-latest, stable)	24s
test (ubuntu-latest, beta, --all-features)	28s
test (ubuntu-latest, stable, --all-features, --target armv5te-unknown-linux-gnueabi, true)	26s
	7m 10s

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