Added 'invert' parameter to make_transition so that it can provide the inverse of the raster it would otherwise provide.

This reverts commit f4023c93.

add compression (bzip2) to add_internal_data and resave objects in sysdata.rda that were saved with version 2

add version = 2 to prevent changing dependency to R 5.3 due to message 'because serialized objects in serialize/load version 3'

add internal data object hfx_deployments and dput expected objects for REI and RI tests instead of in sysdata.r (origin unknown; not in data-raw)

fix #84; hotfix issue where expressions passed via ... (e.g., panel.first) had to be wrapped in 'quote'

fix #64; return output file name; add diagnostic_mode arg to optionally return ffmpeg output (hide by default); add warning when output file exists and overwrite = FALSE