refactoring: added libbdc/bdc_csv

libbdc/CMakeLists.txt

libbdc/bdc_csv/CMakeLists.txt

libbdc/bdc_csv/README.md

libbdc/bdc_csv/bdc_csv.c

libbdc/bdc_csv/bdc_csv.h

libbdc/bdc_csv/tests/bdc_csv_link_test.c

src/CMakeLists.txt

src/cats/CMakeLists.txt

src/cats/environment/environment.h

src/cats/overlays/overlay_habitat_type_cc.c

src/cats_csv/CMakeLists.txt

src/tests/CMakeLists.txt

src/tests/csv_test.c