Added summoned units / mechanics
Summoning, part 2
Summoning, part 3
Blight; trade route fixes
Plot wonders, part 1
Spell code reorganization
Plot wonders, part 2
Plot wonders, part 3
AI fixes
Plot wonders, part 4
Merge branch 'master' of https://github.com/Pazyryk/Ea_III_Sword_and_Sorcery