Revert "Revert "Forggotten Mali...""

This reverts commit 26edfda19fcadc58f6979c8b6b154c52a1197733.
Revert "Revert "Revert "Forggotten Mali..."""

This reverts commit 998c5dade6be7de82b1f20da29673c243a380229.
Integrated RIRSEI

- Integrated (partially) RIRSEI
- Added the Mongols Empire (TODO add "Reform The Mongol Empire"
decision)
- Restored (again) the Empire of Mali
- Renamed e_italia to e_italy to avoid problems with vanilla events
- Little de jure setup changes