Compatch for WtWSMS 0.1.8.5

[IhateTrains]

• Updated removable_file_blocks_wtwsms.txt for latest WtWSMS.
• Added a separate province mappings file for Invictus -> WtWSMS conversions, needed at least until WtWSMS adds playable East Asia.
• Disabled the East Asian Rome division regions for WtWSMS.
• Fixed k_xia not having any de jure empire. Previously the converter tried to assign an empire based on the dominant heritage in the kingdom (Chinese), but because the Chinese heritage has intentionally no heritage->empire mapping, the kingdom was skipped. Now the converter iterates over all heritages in the kingdom (from dominant to least present) until a usable heritage is found.
• Fixed Rome division regions to work with the WtWSMS de jure setup. Now the resulting empires are roughly the same as in a vanilla CK3 conversion. Here's a result for I:R Rome owning the entire map:

closes #3056

[coveralls]

Coverage is 57.241% — wtwsms-compatch into master. No base build found for master.