3D support

[dlfivefifty]

No description provided.

[codecov]

Codecov Report

Merging #3 into master will increase coverage by 0.22%.
The diff coverage is 50%.

@@            Coverage Diff            @@
##           master      #3      +/-   ##
=========================================
+ Coverage     3.9%   4.13%   +0.22%     
=========================================
  Files          75      75              
  Lines        6090    6556     +466     
=========================================
+ Hits          238     271      +33     
- Misses       5852    6285     +433

Impacted Files	Coverage Δ
src/LinearAlgebra/helper.jl	20.23% <ø> (+0.34%)	⬆️
src/Operators/Operator.jl	0% <0%> (ø)	⬆️
src/Space.jl	4.44% <100%> (+2.03%)	⬆️
src/Domains/ProductDomain.jl	40.9% <100%> (+40.9%)	⬆️
src/Multivariate/TensorSpace.jl	6.51% <20%> (+6.51%)	⬆️
src/constructors.jl	20.89% <50%> (+1.71%)	⬆️
src/Domains/Segment.jl	8.21% <0%> (-4.03%)	⬇️
src/Operators/general/FiniteOperator.jl	12% <0%> (-1.64%)	⬇️
src/Fun.jl	8.51% <0%> (-1.35%)	⬇️
src/Domains/Point.jl	13.04% <0%> (-1.25%)	⬇️
... and 59 more

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