Add MDE menu options

[rosswhitfield]

This adds the following right-click menu options

• Set as data
• Set as background/Unset as background
• Rename
• Delete

Currently, I am just using some existing QT icon to mark data and background, these will be changed later to some custom icons. Green arrow is data, black is background.

TO DO (in a later PR):

• change icons used to mark data and background
• add tests

594

[codecov]

Codecov Report

Merging #38 (f9d2839) into next (3a53868) will decrease coverage by 4.75%.
The diff coverage is 48.20%.

@@            Coverage Diff             @@
##             next      #38      +/-   ##
==========================================
- Coverage   79.21%   74.47%   -4.75%     
==========================================
  Files          12       13       +1     
  Lines         765      854      +89     
==========================================
+ Hits          606      636      +30     
- Misses        159      218      +59     

Impacted Files	Coverage Δ
src/shiver/views/histogram_parameters.py	95.72% <ø> (-0.02%)	⬇️
src/shiver/views/workspace_tables.py	44.26% <44.26%> (ø)
src/shiver/models/histogram.py	59.28% <66.66%> (-0.28%)	⬇️
src/shiver/presenters/histogram.py	64.70% <66.66%> (+0.42%)	⬆️
src/shiver/views/histogram.py	73.52% <100.00%> (+2.47%)	⬆️

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[mpatrou]

The test scenario conducted used the file: merged_mde_MnO_25meV_5K_unpol_178921-178926.nxs. It was added several times with different names (Rename action). The various mde workspaces were set/unset background, data and deleted, by selecting the corresponding choices.