Adds various utility functions for modifying options: opt_set(), opt()<- and opt_set_local().
Trying to retrieve an option that is not yet defined will now default to throwing a warning. This behavior can be modified using the on_missing argument to functions that fetch option values.
opts() slightly refactored to produce more constructive output when no option names are provided. You can now use opts(env = package_name) to fetch a full named list of option values. (@dgkf #2)
Generated roxygen2 documentation using as_roxygen_docs() is now more consciencious about R CMD check requirements, moving \usage{} to a new section titled “Checking Option Values”. (@dgkf #2)
options split from dgkf/devutils