Allow applications to select a transparent top-level window.

Allow applications to select a transparent top-level window.

[Issue#] (N/A)

[Problem] Dali::Application would only create opaque top-level windows

[Cause] Hidden APIs

[Solution] Extend Application class to select the type of window required

Usage:

int main(int argc, char **argv)
{
  Application myApplication( Application::New( &argc, &argv, "My Application", Application::TRANSPARENT ) );
  ...
}

Change-Id: I15c646c6ee2a2ca09ae2404ed3336cde01368642
Signed-off-by: Javon Prince <javon.prince@samsung.com>
Signed-off-by: Andrew Cox <andrew.cox@partner.samsung.com>