update: add export statement to module-info.java

src/main/java/module-info.java

@@ -10,4 +10,5 @@ module gui {
     exports de.hdm_stuttgart.battlearena.Main;
     exports de.hdm_stuttgart.battlearena.Controller;
     exports de.hdm_stuttgart.battlearena.Model.Entity;
-}
+    exports de.hdm_stuttgart.battlearena.Model.Inputs;
+}
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