rappster/optionr: Management of customized (and nested) project/package options

The package provides an extendable interface to conveniently create customized project/package options. Options can be specified and retrieved based on path-like names/identifiers (e.g. `output/type/pdf = TRUE` will be translated into the following nested environment structure: `output$type$pdf` with the value being `TRUE`). Also, it allows to specify reactive options, i.e. options that are dynamically linked to other options and thus automatically stay synced.

install.packages("remotes")
remotes::install_github("rappster/optionr")