restrict_list: Restrict a list to the nodes satisfying a given property.
In LAJordanger/leanRcoding: Leaner R Coding

This function is mainly intended to simplify the task of working with list where some of the nodes are arrays, but it could be that it also could be of use in other cases.

1	restrict_list(.list, .property = "is.array", .restrict = TRUE)

`.list`	The list-object to work upon.
`.property`	A character, default `"is.character"` that gives the name of the test function that tests the property of the different nodes. Note, the function must return a logical value.
`.restrict`	Logical value, default `TRUE`, that decides if `.list` should be restricted to those nodes satisfying `.property`, or if the restriction instead should be based on the complementary nodes.