whitebox 2.1.4

Suggest {terra} instead of {raster} and update demo vignette accordingly; drops {rgdal} suggest
Add support for path expansion in wd arguments passed directly to tool functions; this was already supported for other methods of setting the working directory
Updates to wbttools and wbttoolparameters datasets
- Fix for argument_name='k'
- Remove several one and two character flag aliases from argument_name and replace with full name
Add support for showing warning messages in regular interactive/verbose mode, thanks to @alenahav for reporting an issue (#75) with wbt_fd8_flow_accumulation()
Functions that take multiple files are auto-quoted by default; thanks to François-Nicolas Robinne for reporting issue (@FNRobinne; #55) with wbt_mosaic()
Error output is now more verbose, ensuring relevant tool output is displayed to user on error regardless of verbosity, platform, etc. Thanks to Jeffrey W. Rozelle for reporting issue (@jwilliamrozelle; #80) with getting error messages about unsupported raster types

whitebox 2.1.3

Generated whitebox_tools commands no longer include flags for default arguments that are stored in settings.json unless specified by the user.
- Updates to fix issues with permissions to write settings.json; thanks to Henrik (@hewag1975) for reporting problems on Shiny Server (#67)
wbt_install() / install_whitebox() now removes the downloaded zip file on exit thanks to Christoph Stepper (@cstepper; #72)
New default arguments for wbt_list_tools(), wbt_time_in_daylight(), wbt_shadow_image() thanks to Jens Wiesehahn (@wiesehahn; #70, #73)