First work toward moving to a Swing UI for the simulator.

src/main/java/com/loomcom/symon/exceptions/SymonException.java

@@ -0,0 +1,14 @@
+package com.loomcom.symon.exceptions;
+
+
+/**
+ * Superclass for all symon Exceptions.
+ */
+public class SymonException extends Exception {
+    public SymonException(String msg) {
+        super(msg);
+    }
+    public SymonException() {
+        super();
+    }
+}