Replace areas can now use any type of requirement.

Many bug fix in Key Areas and Replace Areas, especially for the
requirements management.

src/com/gpl/rpg/atcontentstudio/model/maps/KeyArea.java

@@ -89,6 +89,9 @@ public class KeyArea extends MapObject {
 				if (requirement.required_value != null) {
 					tmxObject.getProperties().setProperty("requireValue", requirement.required_value.toString());
 				}
+				if (requirement.negated != null) {
+					tmxObject.getProperties().setProperty("requireNegation", Boolean.toString(requirement.negated));
+				}
 			}
 		}
 	}