Add ability to display crosshatches on the wiggle line/xyplot renderer

[cmdcolin]

Adds a setting to display crosshatches, editable via the track menu for wiggle tracks. Moves the "ticks" concept into the model so the renderer can use the ticks

[codecov]

Codecov Report

Merging #1742 (8f8dc8e) into master (60ea4ca) will decrease coverage by 0.03%.
The diff coverage is 53.33%.

@@            Coverage Diff             @@
##           master    #1742      +/-   ##
==========================================
- Coverage   58.86%   58.83%   -0.04%     
==========================================
  Files         454      454              
  Lines       20966    20999      +33     
  Branches     4968     4974       +6     
==========================================
+ Hits        12341    12354      +13     
- Misses       8315     8335      +20     
  Partials      310      310              

Impacted Files	Coverage Δ
...nts/src/SNPCoverageRenderer/SNPCoverageRenderer.ts	100.00% <ø> (ø)
plugins/wiggle/src/WiggleBaseRenderer.ts	100.00% <ø> (ø)
...ns/wiggle/src/LinePlotRenderer/LinePlotRenderer.js	68.62% <22.22%> (-9.95%)	⬇️
...lugins/wiggle/src/XYPlotRenderer/XYPlotRenderer.ts	65.82% <22.22%> (-5.61%)	⬇️
...ins/wiggle/src/LinearWiggleDisplay/models/model.ts	71.49% <63.15%> (-0.99%)	⬇️
...iggleDisplay/components/WiggleDisplayComponent.tsx	100.00% <100.00%> (ø)
packages/core/util/index.ts	82.52% <0.00%> (+0.32%)	⬆️

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