Basic row filtering

[tmichela]

Implements basic row filtering based on column values, there are more requirements for this feature, bu that's already a big enough diff and does already something useful.

One regression: support for standalone comments is dropped in the main table. I implemented another table to view them for the proposal that have used them.

damnit-row-filtering.webm

[codecov]

Codecov Report

Attention: Patch coverage is 80.42105% with 93 lines in your changes missing coverage. Please review.

Project coverage is 75.43%. Comparing base (a0b022f) to head (a26e60e).

Files with missing lines	Patch %	Lines
damnit/gui/table_filter.py	78.17%	67 Missing ⚠️
damnit/gui/table.py	60.00%	16 Missing ⚠️
damnit/gui/standalone_comments.py	89.15%	9 Missing ⚠️
damnit/gui/plot.py	96.87%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #362      +/-   ##
==========================================
- Coverage   75.99%   75.43%   -0.56%     
==========================================
  Files          33       35       +2     
  Lines        5473     5825     +352     
==========================================
+ Hits         4159     4394     +235     
- Misses       1314     1431     +117     

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