desktop: Remove `softbuffer` based raytracing window. #299

Job	Run time
no_std	34s
build (ubuntu, stable, locked, true)	20m 27s
build (windows, stable, locked, false)	40m 5s
miri	1m 45s
build (macos, stable, locked, false)	53m 40s
build (ubuntu, nightly, locked, false)	21m 23s
build (ubuntu, beta, locked, false)	22m 8s
build (ubuntu, stable, latest, false)	20m 46s
build (ubuntu, stable, minimal, false)	1m 7s
features	24m 14s
fuzz	15m 30s
deploy	4s
	3h 41m 43s

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