DDW updated reference files and country lists 2022

The following updates for DDW files are available here, one naming change has been made for 'States of Fragility 2020' previously 'States of Fragility 2018' because the new data is for 2020. Any questions or requests, let me know. Thanks, Duncan.

Income Groups (historical):
[historical_income_groupings.csv](https://github.com/devinit/ddw-data-update-configs/files/8068650/historical_income_groupings.csv)

Least Developed Countries Classification (LDC)
[ldcs.csv](https://github.com/devinit/ddw-data-update-configs/files/8068657/ldcs.csv)

States of Fragility 2020
[fragility.csv](https://github.com/devinit/ddw-data-update-configs/files/8068658/fragility.csv)

OECD CRS aid type reference file
[oecd_crs_aid_type_ref.csv](https://github.com/devinit/ddw-data-update-configs/files/8072680/oecd_crs_aid_type_ref.csv)

OECD CRS channel mapping
[oecd_crs_channel_map.csv](https://github.com/devinit/ddw-data-update-configs/files/8072683/oecd_crs_channel_map.csv)

OECD CRS sector mapping sector code to ITEP sector
[oecd_crs_sector_itep_map.csv](https://github.com/devinit/ddw-data-update-configs/files/8068663/oecd_crs_sector_itep_map.csv)

OECD DAC CRS donor type reference file:
[oecd_crs_donor_type_ref.csv](https://github.com/devinit/ddw-data-update-configs/files/8068665/oecd_crs_donor_type_ref.csv)

Review the linked CSV files for historical income groups, LDCs, States of Fragility 2020, and the OECD CRS reference and mapping data. Compare them with the corresponding data in the repository and verify that the States of Fragility entry uses the 2020 name; done means the updated reference files and country lists are incorporated consistently.

Written by the indexing model from the issue text.