Refactor `plot_fleur`

[janssenhenning]

See #127

This PR makes the following changes to plot_fleur:

• Extracted code for classifying nodes into function classify_node
  • Added functionality to pass on related nodes (Example also use retrieved files for banddos workchain)
• Pass on kwargs to plotting functions to be handled by masci-tools
• Where possible use backend agnostic plotting routines not specifying bokeh or matplotlib plots
• Remove unused arguments

TODO:

• [x] Expand tests
• [x] It would be nice if the functionality is not as hidden in nested imports as it is now. Moving it up to be available in tools directy would definitely be nicer

[codecov[bot]]

Codecov Report

Merging #140 (bf84f71) into develop (e6c64c4) will decrease coverage by 0.02%. The diff coverage is 65.55%.

@@             Coverage Diff             @@
##           develop     #140      +/-   ##
===========================================
- Coverage    64.51%   64.48%   -0.03%     
===========================================
  Files          120      120              
  Lines        13227    13293      +66     
===========================================
+ Hits          8533     8572      +39     
- Misses        4694     4721      +27     

Impacted Files	Coverage Δ
aiida_fleur/tools/dict_util.py	79.68% <8.33%> (-16.47%)	:arrow_down:
aiida_fleur/tools/StructureData_util.py	75.72% <50.00%> (ø)
tests/conftest.py	75.07% <50.00%> (ø)
aiida_fleur/tools/plot/fleur.py	55.13% <66.66%> (+2.71%)	:arrow_up:
tests/tools/test_plot_fleur.py	70.52% <68.42%> (-8.43%)	:arrow_down:
aiida_fleur/calculation/fleur.py	71.29% <100.00%> (ø)
aiida_fleur/cmdline/data/fleurinp.py	95.71% <100.00%> (ø)
aiida_fleur/tools/common_fleur_wf.py	80.00% <100.00%> (ø)
aiida_fleur/tools/common_fleur_wf_util.py	95.68% <100.00%> (ø)
aiida_fleur/tools/element_econfig_list.py	87.36% <100.00%> (ø)
... and 4 more

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