Add CANT_ATTACK, CANT_BE_TARGETED_BY_{ABILITIES,HERO_POWERS} mechanics
Add CANT_ATTACK, CANT_BE_TARGETED_BY_{ABILITIES,HERO_POWERS} mechanics

Fixes #32

Sembiance/hearthstonejson,HearthSim/hearthstonejson,HearthSim/hearthstonejson,Sembiance/hearthstonejson