spreadsheet column filters, SV inspector can now show features from CSV/TSV

[rbuels]

• adds the ability to add additional filters to the spreadsheet view, each of which adds a toolbar to the edit and remove the filter at the top, giving you a (I think) easily understandable "stack" of filters that are easy to control.
• improves the machinery around column types, adding 4 new column types for feature locations (LocString, LocRef, LocStart, and LocEnd), and makes LocString columns be links that will open a new genome view
• adds some basic auto-detection of column data types (Text, Number, LocString) during CSV/TSV import

So now you can make filters on each column, and the SV inspector will show features if your CSV or TSV has 2 locstrings or 2 sets of ref/start/end, and importing will do some limited type detection.

Resolves #690
Also resolves #714
Also resolves #755

[codecov]

Codecov Report

Merging #780 into master will decrease coverage by 1.38%.
The diff coverage is 34.91%.

@@            Coverage Diff             @@
##           master     #780      +/-   ##
==========================================
- Coverage   60.33%   58.95%   -1.39%     
==========================================
  Files         303      315      +12     
  Lines       11427    12111     +684     
  Branches     2620     2756     +136     
==========================================
+ Hits         6895     7140     +245     
- Misses       4251     4646     +395     
- Partials      281      325      +44

Impacted Files	Coverage Δ
packages/core/ui/App.js	89.65% <ø> (ø)	⬆️
packages/core/util/range.js	85.71% <0%> (-14.29%)	⬇️
packages/core/util/mst-reflection.js	72% <0%> (-9.82%)	⬇️
packages/core/assemblyManager.js	74.24% <0%> (-11.73%)	⬇️
...circular-view/src/CircularView/components/Ruler.js	64.7% <0%> (ø)	⬆️
.../src/SpreadsheetView/importAdapters/ImportUtils.ts	93.22% <100%> (+2.31%)	⬆️
packages/core/ui/theme.js	100% <100%> (ø)
packages/core/PluginManager.js	90.81% <100%> (+0.19%)	⬆️
...rc/SpreadsheetView/models/ColumnDataTypes/index.js	100% <100%> (ø)
...or/src/SvInspectorView/models/adhocFeatureUtils.js	13.63% <13.63%> (ø)
... and 40 more

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[rbuels]

strategy to test some of this might be to open a CSV in the SV inspector that has some locstrings in it, check that you can filter using the locstrings, and check that the circular view properly shows the features.