Features Suggestion

Feature description:
Currently the AddSignal() method only accepts an ys argument of type double[]. The API would be much more flexible if the method would accept a generic collection like an IEnumerable<double>. Or if ScottPlot internally needs to know the number of items in the collection then use ICollection<double> or if it needs to index into the collection then use an IList<double>.

An example case that would really benefit from this: plotting growing data. Now you need to manage the resizing of growing array by yourself. It would be much more practical if an List<double> could be used.

Note: Using an IEnumerable, ICollection or IList in most cases does not have a performance penalty with respect to a plain array. If a specific memory layout is assumed in the ScottPlot implementation, Span<T> may provide the necessary constraints.

Code example:

Growing data with array:

// Original array.
var dataArray = new double[] { 1, 4, 9, 16, 25 };
var signalPlot = avaPlot1.Plot.AddSignal(dataArray);
avaPlot1.Plot.Render();

// Resize
Array.Resize(ref dataArray, dataArray.Length * 2);
avaPlot1.Plot.Remove(signalPlot);
var signalPlot2 = avaPlot1.Plot.AddSignal(dataArray);

// Add new element and Render
dataArray[5] = 36;
avaPlot1.Plot.Render();

Growing data with List:

// Original List.
var dataList = new List<double> { 1, 4, 9, 16, 25 };
var signalPlot = avaPlot1.Plot.AddSignal(dataList);
avaPlot1.Plot.Render();

// Add new element (List is resized automatically) and Render.
dataList.Add(36);
avaPlot1.Plot.Render();