Replace 'show all regions' with 'show all regions in assembly'

[cmdcolin]

This is a break out from #1531

This adds a new behavior where we can "Show all regions in assembly" and also changes a behavior so that maxBpPerPx is conditional on totalBp/(self.width*0.9) rather than totalBp/1000

That means on a wide monitor, the behavior for "Show all regions in assembly" would use more of those horizontal pixels than just choosing to squish everything down to 1000

[codecov]

Codecov Report

Merging #1599 (8a42457) into master (6a3b345) will increase coverage by 0.00%.
The diff coverage is 66.66%.

@@           Coverage Diff           @@
##           master    #1599   +/-   ##
=======================================
  Coverage   59.18%   59.18%           
=======================================
  Files         438      438           
  Lines       19907    19924   +17     
  Branches     4675     4679    +4     
=======================================
+ Hits        11781    11792   +11     
- Misses       7832     7838    +6     
  Partials      294      294           

Impacted Files	Coverage Δ
...s/linear-genome-view/src/LinearGenomeView/index.ts	80.37% <66.66%> (-0.51%)	⬇️

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[cmdcolin]

I could also alternatively keep the concept of the divide by 1000, and then only conditionally in showAllRegionsForAssembly zoom out using self.width but I might prefer how it is here