The new API of `evalhyd` is centred around two `evaluate` functions,
one for deterministic evaluation and one for probabilistic evaluation.
The probabilitist side of things is not header-only anymore, and so
additional C++ source files needed to be pointed, which is not working
as of yet. So this version of the R-bindings only exposes the
determinist `evaluate` function for now. The example Rmarkdown is also
updated to reflect those changes.