Extract entropy functions to a lighter-weight package

[IanButterworth]

There are a lot of deps here like Plots.jl that are more front-end than the core entropy calcs.

It would be helpful to make a EntropyMetrics.jl that this depends on, that the user could use without taking on plotting deps.

[Datseris]

This is done in a different package already, https://github.com/JuliaDynamics/ComplexityMeasures.jl

[MattWillFlood]

There are a lot of deps here like Plots.jl that are more front-end than the core entropy calcs.

It would be helpful to make a EntropyMetrics.jl that this depends on, that the user could use without taking on plotting deps.

Thanks for the feedback @IanButterworth! I'll look into this for the next release (but any guidance on how to do this would be welcomed).
Plots.jl is infamously slow to load... hopefully that will improve as Julia grows.

[Datseris]

Use Julia package extensions. EDIT: Example for plotting in TimeseriesSurrogates.jl: https://github.com/JuliaDynamics/TimeseriesSurrogates.jl/blob/main/src/plotting/surrogate_plot.jl and https://github.com/JuliaDynamics/TimeseriesSurrogates.jl/blob/main/ext/TimeseriesSurrogatesVisualizations.jl and https://github.com/JuliaDynamics/TimeseriesSurrogates.jl/blob/main/Project.toml#L27

[MattWillFlood]

Thanks @Datseris !

[Datseris]

I've updated my comment above with links on how we do it for timeseries surrogates. Julia has made this very simple!

[MattWillFlood]

Much appreciated @Datseris , this is very helpful.