Age of Cavemen

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Fixes

Dinomancer altar's lightning targets up to 4 units. Every next unit takes 80% damage.
Skull altar works on every unit type as it should.
Healing Ritual and Dodo Rains work as it should.
Roar of Courage spell does not stack and it's multiplier works as it should.
Chat indicators show valid message count.
Donated unit counter works as it should.
Towers retarget slightly faster.
More minor fixes.