Balance changes

"If you have any last words, speak now."
– Constantin Valdor, the Emperor's Spear

The Primarchs return! Several balance changes aim to bring some of the least popular primarchs back to the front lines:
- Horus: Increased Initiative to High
- Fulgrim: Increased Initiative to High
- Ferrus Manus: Increased Initiative to Medium
- Corax: Reckoning grants Stealth for one turn
- Emperor's Spear: Reduced cost of ability from 2 to 1.
- Valdor's Reckoning: Reduced cost from 16 to 15
- Perturabo's Whispers of Chaos: Reduce cost when any friendly troop dies during your turn (instead of only Iron Warriors)

Adapt and prevail!