8180889: Cleanup of javadoc in java.datatransfer module
Reviewed-by: prr, azvegint

8181082: class-level since tag issues in java.base & java.datatransfer module
Reviewed-by: alanb, serb

8177672: DataFlavor.imageFlavor is null when the java.desktop module is not resolved
Reviewed-by: prr, mchung, alanb

8134152: Public API for java 8 DataFlavor fields do not have @since tag
Reviewed-by: ssadetsky, alexsch

8137059: Run blessed-modifier-order script on client demos and misc. sources
Reviewed-by: jgodinez, serb

8056298: Separate java.awt.datatransfer from the desktop module
Reviewed-by: erikj, alanb, mchung, alexsch