Automate creation of fuzzy matrix

In order to create the fuzzy logic calculations we need to generate a table for all units and the corresponding cross walk. A table is already generated for all BEC variants and Edatope positions, but this needs to be coded to create a table and identify any missing crosswalk values.

Some initial scripting completed, but needs to be reviewed as double counting some areas, needs more work [see here](https://github.com/bcgov/PEMprepr/blob/master/R/create_fuzzy_matrix.R)