Deprecate MaximalOrder -> maximal_order, Order -> order

[thofma]

It was time

[codecov]

Codecov Report

Attention: Patch coverage is 72.29730% with 41 lines in your changes missing coverage. Please review.

Project coverage is 76.56%. Comparing base (bf42d1f) to head (5fbc735).
Report is 5 commits behind head on master.

Files with missing lines	Patch %	Lines
src/NumFieldOrd/NfOrd/Overorders.jl	52.94%	8 Missing ⚠️
src/NumFieldOrd/NfOrd/NfOrd.jl	72.72%	6 Missing ⚠️
src/NumFieldOrd/NfRelOrd/NfRelOrd.jl	80.95%	4 Missing ⚠️
src/AlgAssAbsOrd/Order.jl	85.00%	3 Missing ⚠️
src/FunField/IntClsZx.jl	25.00%	3 Missing ⚠️
src/AlgAss/AlgGrp.jl	0.00%	2 Missing ⚠️
src/AlgAssAbsOrd/PIP/maximal.jl	33.33%	2 Missing ⚠️
src/NumFieldOrd/NfOrd/Clgp/Ctx.jl	0.00%	2 Missing ⚠️
src/AlgAssAbsOrd/PIP/bley_hofmann_johnston.jl	66.66%	1 Missing ⚠️
src/AlgAssAbsOrd/PIP/bley_johnston.jl	50.00%	1 Missing ⚠️
... and 9 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1832      +/-   ##
==========================================
- Coverage   76.57%   76.56%   -0.02%     
==========================================
  Files         362      362              
  Lines      115011   115012       +1     
==========================================
- Hits        88071    88059      -12     
- Misses      26940    26953      +13     

Files with missing lines	Coverage Δ
ext/GAPExt/abelian_layer.jl	91.22% <100.00%> (ø)
src/AlgAss/Map.jl	79.61% <100.00%> (ø)
src/AlgAss/Ramification.jl	100.00% <100.00%> (ø)
src/AlgAssAbsOrd/Conjugacy/Conjugacy.jl	98.32% <100.00%> (ø)
src/AlgAssAbsOrd/Conjugacy/Husert.jl	91.30% <100.00%> (ø)
src/AlgAssAbsOrd/FakeAbsOrdQuoRing.jl	94.59% <100.00%> (ø)
src/AlgAssAbsOrd/Ideal.jl	77.25% <100.00%> (+0.08%)	⬆️
src/AlgAssAbsOrd/LocallyFreeClassGroup.jl	92.47% <ø> (ø)
src/AlgAssAbsOrd/Quotient.jl	100.00% <100.00%> (ø)
src/AlgAssRelOrd/Ideal.jl	73.12% <100.00%> (ø)
... and 36 more

... and 27 files with indirect coverage changes

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