AtomicWrite accepts a destination path and the template contents.

Render atomically renders a file contents to disk, returning a result of whether it would have rendered and actually did render.

DefaultFilePerms are the default file permissions for files rendered onto disk when a specific file permission has not already been specified.

ErrMissingDest is the error returned with the destination is empty.

ErrNoParentDir is the error returned with the parent directory is missing and the user disabled it.

RenderInput is used as input to the render function.

RenderResult is returned and stored.