Update Windows packaging to support Open With... on files

For legacy reasons, the Windows installer with bundled JDK sets the `--jdkhome` location via the shortcut. This does not work when used with `Open With...` on a file, and is susceptible to other issues. Using the launcher directly will either use a system installed JDK or fail to launch at all.

With changes in the launcher in https://github.com/apache/netbeans/pull/8408 it should now be possible to specify a relative link in the `netbeans.conf` file using `BASEDIR`. This will require testing with IDE and platform. Thought should be given whether to keep the shortcut support for packaging older versions, and also whether to filter out the 32-bit launcher from the installed files.