Convert `fov_y` and `view_distance` fields to use `PositiveSign`. #828

Job	Run time
deny	48s
incremental-mutants	0s
build (ubuntu, stable, locked, true)	10m 47s
build (windows, stable, locked, false)	37m 37s
lint (stable)	8m 7s
miri	2m 13s
build (macos, stable, locked, false)	17m 32s
no_std	1m 5s
build (ubuntu, nightly, locked, false)	19m 50s
build (ubuntu, beta, locked, false)	19m 57s
lint (nightly)	5m 34s
build (ubuntu, stable, latest, false)	20m 19s
lint (beta)	7m 12s
build (ubuntu, stable, minimal, false)	21m 0s
deploy	9s
fuzz	15m 15s
features	23m 10s
	3h 30m 35s

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