Remove unintended nameof type piracy

[pablosanjose]

Closes #327

The reason for #327 was an obscure problem with stdlib Serialization caused by the following methods

Base.nameof(::Type{<:OrbitalSliceMatrix}) = "OrbitalSliceMatrix"
Base.nameof(::Type{<:OrbitalSliceVector}) = "OrbitalSliceVector"
Base.nameof(::Type{<:CompressedOrbitalMatrix}) = "CompressedOrbitalMatrix"

It might not seem at first sight, but this is a rookie mistake: those are doing pretty terrible nameof piracy (even though OrbitalSliceArray etc. are all property of Quantica), and were causing all sort of havoc, particularly in Distributed calculations (which relies on Serialization, which mysteriously choked due to the above)

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 40.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 92.31%. Comparing base (6197b8b) to head (c8339a1).
Report is 7 commits behind head on master.

Files with missing lines	Patch %	Lines
src/show.jl	40.00%	3 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #328      +/-   ##
==========================================
- Coverage   92.47%   92.31%   -0.16%     
==========================================
  Files          39       39              
  Lines        6907     7001      +94     
==========================================
+ Hits         6387     6463      +76     
- Misses        520      538      +18     

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