CLI: Refactored significantly to work with new selection logic and management.

cli/src/main/groovy/com/jdbernard/wdiwtlt/cli/CliErr.groovy

@@ -0,0 +1,9 @@
+package com.jdbernard.wdiwtlt.cli
+
+public class CliErr extends Exception {
+    public CliErr(String message) { super(message) }
+    public CliErr(String message, Throwable t) { super(message, t) }
+    public CliErr(Throwable t) { super(t) }
+
+    public static err(String msg) { throw new CliErr(msg) }
+}