Added the unique skill "Oracle"

A unique skill "Oracle" has been added to Sleuf. If you have him, the experience of all allies will increase by 30 at the end of the map (if the experience is 70 or more, it will increase to 99).

Sleuf is a priest who went on a journey after taking an oracle, and the skill name is inspired by that.

The effect of this skill is based on the specification that existed in FE2, etc., where all allies' experience increases at the end of the map. It may be hard to feel the benefit in games without free maps, but there may be an advantage in that units that do not deploy can also gain experience.