Use Function in all inputs of SiteModel #1196
Description
It would be nice to use Function instead of RealParameter for all inputs of SiteModel, so that we could use feast.function.Slice in XML:
final public Input<RealParameter> muParameterInput = new Input<>("mutationRate", "mutation rate (defaults to 1.0)");
...
final public Input<RealParameter> shapeParameterInput =
new Input<>("shape", "shape parameter of gamma distribution. Ignored if gammaCategoryCount 1 or less");
final public Input<RealParameter> invarParameterInput =
new Input<>("proportionInvariant", "proportion of sites that is invariant: should be between 0 (default) and 1");