Allow some exceptions to be handled

src/main/java/carpet/script/exception/ProcessedThrowStatement.java

@@ -0,0 +1,20 @@
+package carpet.script.exception;
+
+import java.util.List;
+
+import carpet.script.Context;
+import carpet.script.Expression;
+import carpet.script.Tokenizer.Token;
+import carpet.script.value.FunctionValue;
+import carpet.script.value.Value;
+
+public class ProcessedThrowStatement extends ExpressionException {
+    public final Value exceptionName;
+    public final String message;
+    
+    public ProcessedThrowStatement(Context c, Expression e, Token token, String message, List<FunctionValue> stack, Value exceptionName) {
+        super(c, e, token, "Unhandled exception: "+message, stack);
+        this.exceptionName = exceptionName;
+        this.message = message;
+    }
+}