imports and better error reporting and stacktraces

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

@@ -1,25 +1,23 @@
 package carpet.script.value;
 
-import carpet.script.exception.ExpressionException;
-
 public abstract class FrameworkValue extends Value
 {
     @Override
     public String getString()
     {
-        throw new ExpressionException("Scarpet language component cannot be used");
+        throw new UnsupportedOperationException("Scarpet language component cannot be used");
     }
 
     @Override
     public boolean getBoolean()
     {
-        throw new ExpressionException("Scarpet language component cannot be used");
+        throw new UnsupportedOperationException("Scarpet language component cannot be used");
     }
 
     @Override
     public Value clone()
     {
-        throw new ExpressionException("Scarpet language component cannot be used");
+        throw new UnsupportedOperationException("Scarpet language component cannot be used");
     }
 
     @Override