Hotfix 1.5.6-1

Fixes

• Fixed a bug where unit cooldowns were being carried over between waves. This caused some troops in the new wave to spawn much later than intended, and in certain cases the wave could end prematurely before all units were summoned.
  (Reported by: "ESDave")
• Fixed an issue where upgrade progress was not being counted correctly, preventing the achievement "At my signal, unleash hell." from unlocking.
  (Reported by: "ESDave" and "FresherWater")

Thanks for the reports and for helping improve Countless Army!