Version 38 Update 13 - Balancing and AI improvements

(Yes, I know there's been a lot of updates! But things are changing rapidly)

Changes

Updated default decks and increased gold per win to 25 to compensate for the slower new player experience
Removed summon mana cost for Master Golem and King of Beasts
Fountain Elemental and Dark Hunter's rules texts have been cleaned up
Grave Aura only affects friendly discard zones instead of all
Grove Tyrant is now 6/6 (down from 8/8), and has impact and quickness (instead of only impact)
Call of Darkness is back on 3-cost (down from 4-cost)
Tainted Beasts effect now triggers only once per turn
Several more improvements to AI
Changed pack rarity code to be simplified and changed pack rarities to rare: 65%; epic: 25%; legendary: 10%
Possibly fixed a bug regarding timezones and quest resets
Fixed a bug with cards that have AI essence nudges