Threshold for indicators on SNPCoverage + inverted bargraph of interbase counts for sub-threshold events

[cmdcolin]

Current code for drawing the insertion draws an indicator if there is even 1 insertion, which can make too many insertion indicators for long noisy reads especially

This adds a threshold based on this so that at least 30% of reads by default would share the indicator. This filters out many false positives I think

In addition to drawing the indicator, I added a "upside down histogram" of the interbase info such as clip/insertion. The upside-down nature emphasizes that these do not contribute to the count in the pileup. This captures things below 30%, and that is especially handy when there is a "region" that has a lot of clipping or the insertion has a fuzzy position by the aligner, which I think is biologically a real phenomenon (see cuteSV paper for how they call fuzzy insertion positions)

Sort of xref #1065

two examples from volvox

example from human, sometimes there are tiny things that can catch your eye that stand out more than background but might not trigger the "indicatorThreshold"

note that the settings for "drawIndicators" and "drawInterbaseFuzz" are configurable booleans, and could be made track menu items

[codecov]

Codecov Report

Merging #1687 (121ab19) into master (045eb53) will decrease coverage by 0.03%.
The diff coverage is 64.86%.

@@            Coverage Diff             @@
##           master    #1687      +/-   ##
==========================================
- Coverage   58.94%   58.90%   -0.04%     
==========================================
  Files         446      446              
  Lines       20434    20518      +84     
  Branches     4805     4842      +37     
==========================================
+ Hits        12045    12087      +42     
- Misses       8089     8129      +40     
- Partials      300      302       +2     

Impacted Files	Coverage Δ
...rc/LinearSNPCoverageDisplay/models/configSchema.ts	100.00% <ø> (ø)
...archicalTrackSelectorWidget/components/Category.js	86.66% <ø> (ø)
...otplot-view/src/DotplotRenderer/DotplotRenderer.ts	64.93% <0.00%> (ø)
...lot-view/src/DotplotView/components/ImportForm.tsx	12.50% <0.00%> (-0.33%)	⬇️
...tenyRenderer/components/LinearSyntenyRendering.tsx	1.75% <0.00%> (-0.07%)	⬇️
...ew/src/LinearSyntenyView/components/ImportForm.tsx	6.66% <0.00%> (-0.16%)	⬇️
plugins/linear-comparative-view/src/index.tsx	35.13% <0.00%> (-1.49%)	⬇️
...aseLinearDisplay/models/BaseLinearDisplayModel.tsx	73.86% <ø> (ø)
...LinearWiggleDisplay/components/SetMinMaxDialog.tsx	3.84% <0.00%> (-1.16%)	⬇️
...se-react-linear-genome-view/src/createViewState.ts	42.85% <0.00%> (ø)
... and 28 more

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[cmdcolin]

Marking this as ready for review. I think the indicators end up being much more reasonable than having an indicator for every insertion