Periodic indexing

[lkdvos]

Not entirely sure why I didn't come up with this sooner, but this is a light version of the whole PeriodicArray machinery that just hides all of the mod stuff behind getters and setters.

I do still want to eventually allow more general array types with tilings etc, but this is non-breaking and at least slightly improves some of the more messy patches of code

[codecov]

Codecov Report

❌ Patch coverage is 93.58289% with 12 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/utility/util.jl	76.92%	3 Missing ⚠️
src/algorithms/contractions/bp_contractions.jl	95.45%	2 Missing ⚠️
src/environments/ctmrg_environments.jl	50.00%	2 Missing ⚠️
src/environments/bp_environments.jl	50.00%	1 Missing ⚠️
src/networks/infinitesquarenetwork.jl	66.66%	1 Missing ⚠️
src/operators/infinitepepo.jl	80.00%	1 Missing ⚠️
src/states/infinitepartitionfunction.jl	66.66%	1 Missing ⚠️
src/states/infinitepeps.jl	75.00%	1 Missing ⚠️

Files with missing lines	Coverage Δ
src/algorithms/contractions/absorb_weight.jl	100.00% <100.00%> (ø)
src/algorithms/contractions/bondenv/benv_ctm.jl	100.00% <100.00%> (ø)
.../algorithms/contractions/correlator/pepo_1layer.jl	100.00% <100.00%> (ø)
src/algorithms/contractions/correlator/peps.jl	100.00% <100.00%> (ø)
src/algorithms/contractions/ctmrg/gaugefix.jl	95.45% <ø> (ø)
...lgorithms/contractions/ctmrg/renormalize_corner.jl	94.73% <100.00%> (ø)
.../algorithms/contractions/ctmrg/renormalize_edge.jl	65.88% <ø> (ø)
src/algorithms/contractions/localoperator.jl	96.45% <100.00%> (ø)
src/algorithms/correlators.jl	96.87% <100.00%> (ø)
src/algorithms/ctmrg/sequential.jl	98.41% <100.00%> (ø)
... and 15 more

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