Remove dependency on /data-raw/ for retrieving and importing sauer_results

[trashbirdecology]

The entire (list) of sauer_results is very large.

• Need to grab, download, and munge (i.e. sauer_results.R) as a function of the package build/install, not as data.rd. Or consider providing a function to retrieve all of these locally, and save a single file (e.g., the longest and largest scale) of the results as sauer_results.

• If writing as a function to call in vignette, etc., add optional filters to reduce object size by "model", "region", "region.name", "species.name", etc...