Add manifest directives and icons for WinRT

For store packaging, WinRT/Windows Phone apps must have certain
capabilities and icons set in the manifest.

Change-Id: I89032090f540c0e834dea0ca6436bea53f4e5bfb
Reviewed-by: Caroline Chao <caroline.chao@digia.com>
Reviewed-by: Oliver Wolff <oliver.wolff@digia.com>