finally someone who appreciates brittany

@GODOG Yeah seem Paradox has changed how the diplomacy_manager works in 1.0.10. Cannot overwrite a preexisting entry like a vassal relationship just by inserting one in a mod. I'll put together an on_action or event that works around this.

This doesn't seem to work, Brittany starts as a Vassal instead of a Tributary.

For those interested, planning to move my Breton names over from my namelist mod, which is likely shuttered for now, into this. I'll also work to get some advances added since those are fairly simple. But I likely won't be adding events for a little while. Still plenty I want to add to Flanders.