Report stack traces through the logger (#1050)

src/main/java/carpet/script/value/Value.java

@@ -1,5 +1,6 @@
 package carpet.script.value;
 
+import carpet.CarpetSettings;
 import carpet.script.exception.InternalExpressionException;
 import com.google.gson.JsonElement;
 import com.google.gson.JsonPrimitive;
@@ -42,7 +43,7 @@ public abstract class Value implements Comparable<Value>, Cloneable
         catch (CloneNotSupportedException e)
         {
             // should not happen
-            e.printStackTrace();
+            CarpetSettings.LOG.catching(e);
             throw new InternalExpressionException("Variable of type "+getTypeString()+" is not cloneable. Tell gnembon about it, this shoudn't happen");
         }
         copy.boundVariable = var;