Implement BiDi mirroring

[Juan Lang]

Hi Khaled,

+void doMirror(WCHAR* ch)

This should be static.

+        else if(*ch == mirrored[k].first)
+            {
+                *ch = mirrored[k].mirror;
+                return;
+            }

The else if block is indented one level too many.

Thanks,
--Juan