Fixes #17, #16, #19

Summary of changes in this pull request

• updated the clip wrapper version, and switched to using it for local files. This makes one script unnecessary.
• Small tune up to naming of configuration (slope -> slope_deg)
• Set flooded areas as NOT_SUITABLE by default (these are mostly swamps, wetlands or estuaries).
• Standardisation to EPSG:4326 is explicit in settings.yaml. The implementation in minimal on purpose. This could be made fully flexible later.

Reviewer checklist

• There are no pip dependencies in the module's environment files (workflow/envs/).
• All rules use pathvars (e.g., <results>) in their inputs and outputs.
• The integration test-suite is successful, including:
  • pre-commit.ci tests pass.
  • tests pass for all relevant OS configurations (linux, osx, windows).
• Module documentation is up-to-date, including:
  • INTERFACE.yaml mentions all relevant pathvars and wildcards.
  • README.md describes how to use the module and has the necessary citations.