Add API for accessing command-line arguments.

- Add process module with Process class.
- Add "arguments" and "allArguments" methods.
- Docs for same.
- Support passing additional arguments to command line.
- Add "--help" support to command line.

doc/site/modules/template.html

@@ -37,6 +37,7 @@
       <h2>cli</h2>
       <ul>
         <li><a href="io">io</a></li>
+        <li><a href="process">process</a></li>
         <li><a href="scheduler">scheduler</a></li>
         <li><a href="timer">timer</a></li>
       </ul>
@@ -64,6 +65,7 @@
         <td>
           <ul>
             <li><a href="io">io</a></li>
+            <li><a href="process">process</a></li>
             <li><a href="scheduler">scheduler</a></li>
             <li><a href="timer">timer</a></li>
           </ul>