[Android] Support http://w3c.github.io/manifest/ for packaging tool

Support "start_url", "xwalk_launch_screen" and "xwalk_permissions" field in manifest.
The legacy field "launch_path", "app.launch.local_path", "launch_screen" and "permissions"
are still supported, but will print a warning message.
There is a little difference, it's test need some icon resource. Put it here with "launchScreen/manifest.json" can use the icon resource.