Simple implementation for 2D and 3D charts with SkiaSharp
Fix Conversion of Models (& Charts) from Vec2 --> double[] x, y (?)
covert methods CopyLineValues, CopyPointValues to static (reduce duplicate code...)
add toggle button to hide / (disable?) rendered latex img, and reduce a bit the height of slider rows in variables_list template...
--> double precision floating points serialized --> gnuplot parsing, check it works
member this.Add (key: string, value: 'T) =
variables, replace Range with float * float --> maps.variables.Add "var_name" (0.31, 9.3)