make ParameterTable flexible with custom modifiers

[aaronpeikert]

At the moment, most of parameter table is fixed. Custom modifiers are not propagated through from StenoGraphs
I have done my part on StenoGraphs.jl v0.4.4 JuliaRegistries/General#142086 to represent Graphs (and Edge and Node Modifiers) as DataFrames.jl

The print method should also list additional columns but other wise should not change.