support upsidedown
reintegrate crashlytics
clean linked libraries
facility will attack no matter whether attacker is in a passed tile or not
fire will not damage building
add disposable property for facility
disposable facility will not be attacked, but it will disappear after defense
adjust initial soldiers
add the morale concept
explore will cost morale
using clue will cost morale
use skill will cost morale
update version info to v3.4