Currently the cosmere library mod handles granting powers, even though it doesn't properly know what allomancy/feruchemy etc is.

We should refactor things so that it's the sub mods themselves that grant the powers. This is a little more complicated because there's lore related rules to what powers can't be granted with other powers, like mistborn and full feruchemist.

Proposed changes:
We set up events for when powers are needing to be granted:

• onGrantStartingPowers
• onBreedGrantPowers
• etc

and then have those events track:

• whether a listener has said yes I wanna give powers.
• what powers it wants to give
• And whether that listener says other powers are blacklisted from being granted with it (mistborn/feruchemist)

The event should then take all that information and then decide resolve the granting of powers using that information.