feat: added army strength together with string representation
What are the key features of this change
Added strength to an army which is accumulated by adding each unit's health, armor and attack. Bonuses are not taken into consideration. This makes it slightly easier to understand two armies chance of winning.
closes: None
Size of change: small
Checklist
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Javadoc is added to methods and classes -
Tests are added to feature -
Build tool test passed