The org.eclipse.sdk branding-plugin was missing the splash-screen,
similar to the other branding-plugin org.eclipse.platform.
This enables the splash-screen when running the 'org.eclipse.sdk.ide'
product in launch configurations for secondary Eclipse instances.

Additionally the about-dialog branding-icon and the (now new)
splash-screen in org.eclipse.sdk weren't updated during the preparation
of a new development cycle, again like org.eclipse.platform.