Basic idea/big picture
When fighting the attacker not only shoots at the enemey. The attacked element can be in different states that make it harder or easier to be hit. They may be standing still or moving quickly. They can stand in the open or hide behind barricades. This should be considered when calculating if a shot hits something.

Technical background
There needs to be an attribute that holds the current state that is relevant for the defense. Maybe it can be infered from other attributes like moving. For the beginning not all imaginable situations must be modeled (movement, cover, terrain, maneuverability and so on). A simple stance might be sufficient for the start. Later the commander can tell elements which stance to use by a command.

The hit calculation should use percentages to reduce the chance of a hit further for better cover. Absolute values can easily lead to impossible to achieve values.

Related issues/Prerequisites
Continues #79