0.13.01 (Nivve) CB and sea religions

- Severely restricted the Spread Religion casus belli. It can now only
be used on a ruler that neighbours a demesne province and that province
must be the same religion as the ruler.
- Changed scopes from location to capital_scope. In most cases this does
nothing, however it is a contingency for when a location scope caused
the sea provinces to have a religion (when the location of a ruler is on
a ship and his location is converted).