iterating on API

[heckj]

Iterating heavily on the API to embrace some level of generics, add features related to generating nice tick labels, and setting up a foundation that can be expanded into different kinds of scales as well as diverse output types.

[codecov]

Codecov Report

Merging #7 (476361a) into main (c449ef0) will decrease coverage by 5.98%.
The diff coverage is 90.35%.

@@            Coverage Diff             @@
##             main       #7      +/-   ##
==========================================
- Coverage   96.88%   90.89%   -5.99%     
==========================================
  Files          16       16              
  Lines         449     1285     +836     
==========================================
+ Hits          435     1168     +733     
- Misses         14      117     +103     

Impacted Files	Coverage Δ
Tests/SwiftVizTests/PowerScaleTests.swift	61.29% <61.29%> (ø)
Tests/SwiftVizTests/LogScaleTests.swift	80.89% <75.60%> (-19.11%)	⬇️
Tests/SwiftVizTests/TickTests.swift	78.57% <78.57%> (ø)
Tests/SwiftVizTests/LinearScaleTests.swift	81.33% <80.10%> (-18.67%)	⬇️
Sources/SwiftViz/TickScale.swift	86.48% <86.48%> (ø)
Tests/SwiftVizTests/ScaleFactoryTests.swift	88.00% <88.00%> (ø)
Sources/SwiftViz/NiceValue.swift	95.31% <95.31%> (ø)
Sources/SwiftViz/LogScale.swift	95.83% <95.83%> (-4.17%)	⬇️
Sources/SwiftViz/PowerScale.swift	96.66% <96.66%> (ø)
Sources/SwiftViz/LinearScale.swift	100.00% <100.00%> (ø)
... and 6 more

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