add zombie controller and implement damage system; update gun controller for raycasting; modify prefab and scene settings

Assets/Scenes/MyFactory.unity

@@ -3374,7 +3374,10 @@ PrefabInstance:
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@@ -10071,6 +10074,37 @@ PrefabInstance:
     m_AddedGameObjects: []
     m_AddedComponents: []
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+  m_Component:
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@@ -26240,6 +26274,9 @@ MonoBehaviour:
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+  damage: 25
 --- !u!1001 &1837025048
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