Add OperationError error type and use for errors to be printed to the output panel

src/core/errors/OperationError.mjs

@@ -0,0 +1,20 @@
+/**
+ * Create custom error type for handling operation input errors.
+ * i.e. where the operation can handle the error and print a
+ * message to the screen.
+ */
+class OperationError extends Error {
+    /**
+     * Standard error constructor. Adds no new behaviour.
+     * @param args standard error args
+     */
+    constructor(...args) {
+        super(...args);
+
+        if (Error.captureStackTrace) {
+            Error.captureStackTrace(this, OperationError);
+        }
+    }
+}
+
+export default OperationError;