Changes

Bug 570604 - New Java project: enable '--release' option for Java 7+

When creating a Java project, the '--release' option should be enabled
if the compiler compliance level is 1.7 or higher; otherwise it should
be disabled.

Change-Id: I00f575a82cb1ee31639774e1bbc554f473fdc5cb
Signed-off-by: Holger Voormann <eclipse@voormann.de>
Reviewed-on: https://git.eclipse.org/r/c/jdt/eclipse.jdt.ui/+/175347
Tested-by: JDT Bot <jdt-bot@eclipse.org>
Reviewed-by: Kalyan Prasad Tatavarthi <kalyan_prasad@in.ibm.com>