Reorganize project layout and QOL features

[kMutagene]

This project has gotten to a size where it is not easy to find things without adding a layer of organization.

Things to do here:

• Trace/TraceStyle:

  • get rid of Trace/Trace3d type separation
  • Add multiple new Trace types: Trace2D, TraceMap, TracePolar, TraceTernary, TraceCarpet, TraceDomain. Especially usefull for deciding subplot id for things like Chart.Grid. Maybe use an interface ITrace instead of inheritance from the default Trace type
  • TraceStyle functions should be easier to use on Charts. Add Chart.withTraceStyle(styleFunction:Trace->Trace)

• Chart:
  refactor into separate files with type extensions for Chart, e.g.:
  folder Chart -> Chart2D.fs (all standard 2D charts) -> Chart3D.fs (type extensions for 3D charts) -> ChartPolar.fs (type extensions for polar charts) -> 3D.fs ... etc

• Layout objects:

  • not sure if there is an inherent order here
  • at least put all of the in a folder called LayoutObjects