Update CDR downscaling and gridding

[x] develop CCS potential map (@gidden)
[ ] decide how to deal with 0-proxy isos without an existing base-year pattern (@coroa)
- an example for a first approach is in raw cells in generate_non_ceds_proxy_netcdfs.ipynb in ...\WP 1\data\gridding_process_files
- how to deal with maximum potential values
[ ] develop renewables potential map (@coroa)
[ ] develop proxy maps applying CCS potential mask to drivers (renewable potentials [DACCS, Industry]) (@gidden)
[x] request and use LU maps for BECCS and A/R proxies

IAMconsortium / concordia