source_directory: Source files recursively
In DavidBarke/QWUtils: Useful Methods For Programming with Shiny

Modification of sourceDirectory which repairs the behaviour of the ... argument, so that chdir and local can be passed to sourceTo.

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source_directory(path, pattern = ".*[.](r|R|s|S|q)([.](lnk|LNK))*$",
  recursive = TRUE, envir = parent.frame(), onError = c("error",
  "warning", "skip"), modifiedOnly = FALSE, ..., verbose = FALSE)

`path`	A path to a directory to be sourced.
`pattern`	A regular expression file name pattern to identify source code files.
`recursive`	If `TRUE`, subdirectories are recursively sourced first, otherwise not.
`envir`	An `environment` in which the code should be evaluated.
`onError`	If an error occurs, the error may stop the job, give a warning, or silently be skipped.
`modifiedOnly`	If `TRUE`, only files that are modified since the last time they were sourced are sourced, otherwise regardless.
`...`	Additional arguments passed to `sourceTo`().
`verbose`	A `logical` or a `Verbose` object.