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Secret Society Vampire Promotion

This gives the vampire unit the ability to gain XP along with a custom promotion tree.

Requires Ethiopia DLC and secret societies mode. (will give error if enabled without playing a secret society game.)

There is now a similar mod for the voidsingers:
https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=2443281261

I made a more detailed list of changes for the above listed follow up mod, so same here for symmetry.
Vampires:
-Movement (2>3), sight (2>3); have been increased.

Discover Chance:
-increased to 100, because having it be random is fun in theory but not in practice.