Cleanup

[n-claes]

PR description

This PR cleans up old modules that were moved and/or reworked but remained in the repository.

Bugfixes

Pylbo

• fixed a bug where querying for derived eigenfunctions on a multispectrum plot errored
• fixed an inconsistency in colourmapping for interactive continua on a multispectrum plot

[codecov]

Codecov Report

Merging #83 (5d8b3a3) into develop (da63375) will increase coverage by 0.03%.
The diff coverage is 95.23%.

@@             Coverage Diff             @@
##           develop      #83      +/-   ##
===========================================
+ Coverage    86.98%   87.01%   +0.03%     
===========================================
  Files          102      102              
  Lines         5923     5922       -1     
===========================================
+ Hits          5152     5153       +1     
+ Misses         771      769       -2     

Flag	Coverage Δ
legolas	88.74% <100.00%> (-0.01%)	⬇️
pylbo	83.56% <93.33%> (+0.10%)	⬆️

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