Made some changes to Solo variants

To conform to some the rules changes I'm making to Solo Adventures 2.0, I had to make some changes to a few cards.

Baba Yaga, Breach the Gates: changed "Gold" to "Treasure"

Crypt Ghoul, Crypt Guard, Revenant: the conditions for their abilities varied, i.e. when the card was played in combat or when discarded. I was oblivious to a unifying condition that I already had in the game...the Threat Track. It makes more sense to trigger their abilities using the Threat Track, which represents the threat of doom increasing.

Card text has already been changed and new version of these cards have been posted. I'll need to make a few more changes to some Event cards, as I was under the mistaken impression that these are randomly-drawn, global actions, when in fact you put them in your deck to give yourself an advantage. Some of the cards need to change because they negatively affect both players...