Backwards compatible Listener API

[thekid]

See https://github.com/xp-framework/unittest/pull/37#issuecomment-537023414:

Create a new interface unittest.Listener (without the Test prefix) with the new method. Clients can now > implement both, and based on type existance, pass the correct one

index b1802ef..92ec6af 100755
--- a/src/main/php/unittest/TestListener.class.php
+++ b/src/main/php/unittest/TestListener.class.php
@@ -4,6 +4,7 @@
  * To intercept certain events during a test run, add a listener to
  * the test suite before calling its run() or runTest() methods.
  *
+ * @deprecated Use Listener instead!
  * @test  xp://net.xp_framework.unittest.tests.ListenerTest
  * @see   xp://unittest.TestSuite#addListener
  */
@@ -12,35 +13,35 @@ interface TestListener {
   /**
    * Called when a test case starts.
    *
-   * @param   unittest.TestCase failure
+   * @param  unittest.TestCase $test
    */
-  public function testStarted(TestCase $case);
+  public function testStarted(TestCase $test);