Speed up tests

[alfredclwong]

Would still like to use XUnit.jl to parallelise tests, but the improvements here are already good enough to merit a PR.

Fixes #54

[codecov-io]

Codecov Report

Merging #99 (6000097) into main (23e0376) will decrease coverage by 1.15%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main      #99      +/-   ##
==========================================
- Coverage   47.61%   46.45%   -1.16%     
==========================================
  Files          57       56       -1     
  Lines        6620     6578      -42     
==========================================
- Hits         3152     3056      -96     
- Misses       3468     3522      +54     

Impacted Files	Coverage Δ
src/Geometry/Primitives/Curves/BSpline.jl	66.15% <0.00%> (-11.71%)	⬇️
src/Geometry/Primitives/Qtype.jl	75.00% <0.00%> (-8.34%)	⬇️
src/Optical/LensAssembly.jl	48.22% <0.00%> (-7.33%)	⬇️
src/Optical/OpticalInterface.jl	62.68% <0.00%> (-4.42%)	⬇️
src/Geometry/CSG/Intersection.jl	48.57% <0.00%> (-2.14%)	⬇️
src/Geometry/Geometry.jl	0.00% <0.00%> (-1.86%)	⬇️
src/Geometry/Primitives/Curves/Bezier.jl	54.87% <0.00%> (-1.83%)	⬇️
src/Geometry/CSG/Interval.jl	83.20% <0.00%> (-0.37%)	⬇️
src/Optical/OpticalSystem.jl	35.89% <0.00%> (-0.33%)	⬇️
src/Geometry/CSG/CSG.jl	84.88% <0.00%> (-0.06%)	⬇️
... and 2 more

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[BrianGun]

@alfredclwong Looked at the code more closely. Allocations tests are still being run. I'll approve as soon as the checks finish.

[alfredclwong]

Agreed - the Allocations testset is very important. It is included in alltestsets:

OpticSim.jl/test/runtests.jl

Line 94 in fcca20a

"Allocations",

[alfredclwong]

1.5 is failing for some reason. Will look into this tmrw.

[alfredclwong]

Caching all of .julia runs us into some weird problems, so I'll just stick with .julia/artifacts. There's probably a good reason why everyone does it this way.