@StandardException feature working draft

* move feature under experimental
* replace ProviderFor with Provides
* add doc material (to be completed)
* add author

website/usageExamples/StandardExceptionExample_post.jpage

@@ -0,0 +1,16 @@
+public class ExampleException extends Exception {
+    public ExampleException() {
+    }
+
+    public ExampleException(String message) {
+        super(message);
+    }
+
+    public ExampleException(Throwable cause) {
+        super(cause);
+    }
+
+    public ExampleException(String message, Throwable cause) {
+        super(message, cause);
+    }
+}