Store persistent keys and values. Storage is per-project; if there is no project currently active, then a global store is used.
setPersistentValue(name, value)
getPersistentValue(name)The key name.
The key value.
The stored value as a character vector (NULL if no value
of the specified name is available).
The setPersistentValue and getPersistentValue functions
were added in version 1.1.57 of RStudio.