Loads additional packages as part of the animovement.
Details
When the animovement is extended calling animovement_extend(...), the packages that are not attached are attached, but conflicts are checked for all specified packages.
An options("animovement.extend") is set which stores these extension packages, regardless of whether they were already attached or not. When calling
animovement_packages, animovement_deps, animovement_conflicts, animovement_update, animovement_sitrep or animovement_detach, these packages are included as part of the animovement.
To extend the animovement for the current session when it is not yet loaded, users can also set options(animovement.extend = c(...)), where c(...)
is a character vector of package names, before calling library(animovement).