tests

Planar projection (perspective/orthographic combination projection) #248

Job	Run time
Benchmark (ubuntu-latest, nightly, rand,serde,mint)	1m 48s
Test (windows-latest, stable)	1m 37s
Test (windows-latest, stable, serde,mint)	1m 55s
Test (windows-latest, nightly)	1m 3s
Test (windows-latest, nightly, serde,mint)	1m 8s
Test (ubuntu-latest, stable)	19s
Test (ubuntu-latest, stable, serde,mint)	23s
Test (ubuntu-latest, nightly)	21s
Test (ubuntu-latest, nightly, serde,mint)	22s
Test (macos-latest, stable)	17s
Test (macos-latest, stable, serde,mint)	19s
Test (macos-latest, nightly)	22s
Test (macos-latest, nightly, serde,mint)	24s
	10m 18s

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