Delete prisons

Made mod for testing. Tested on XXL map with all heroes in prison. Have a look and let's decide if there are ways to improve it. For now:

1) It deletes all prisons
2) It stores all heroes level, mana, movement and skills (both primary and secondary)
3) It reset all prisoners to initial stats
4) On first day it runs every player tavern, adds all heroes at pool then it picks two randomly and places them left/right.