Move `render_orthographic()` code to render crate. #629

Job	Run time
miri	1m 48s
build (ubuntu, stable, locked, true)	16m 1s
incremental-mutants	0s
deny	46s
build (windows, stable, locked, false)	25m 34s
no_std	32s
build (macos, stable, locked, false)	13m 30s
build (ubuntu, nightly, locked, false)	23m 34s
build (ubuntu, beta, locked, false)	24m 10s
build (ubuntu, stable, latest, false)	19m 26s
build (ubuntu, stable, minimal, false)	19m 1s
fuzz	15m 50s
features	29m 29s
deploy	4s
	3h 9m 45s

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