Auto categorical level mapping

[kevinykuo]

• factor flag - 0 = NO, 1 = YES
• exhibit_type is not currently used, should remove
• fleet flag - 0 = NO, 1 = Fleet rated, 2 = Synthetic fleet
• major coverage type
• minor coverage type
• loss transfer flag

[kevinykuo]

• KoL
• paid/outstanding

[kevinykuo]

Can't find a dictionary for KoL, tracking in https://github.com/kasaai/gisadata/issues/20