Export of Emacs org-mode table support

* added new command-line option '--export-orgmode <FILE>' to create
  Emacs org-mode table output by reusing markup result formatting
* based on the new MarkdownFormatter trait, see PR #490

src/cli.rs

@@ -241,6 +241,13 @@ fn build_command() -> Command<'static> {
                 .value_name("FILE")
                 .help("Export the timing summary statistics as a Markdown table to the given FILE."),
         )
+        .arg(
+            Arg::new("export-orgmode")
+                .long("export-orgmode")
+                .takes_value(true)
+                .value_name("FILE")
+                .help("Export the timing summary statistics as a Emacs org-mode table to the given FILE."),
+        )
         .arg(
             Arg::new("show-output")
                 .long("show-output")