Summary
-------
Remove the deprecated public constructors javafx.css.Selector and javafx.css.converter.ShapeConverter

Problem
-------

- Constructor for class javafx.css.Selector was deprecated for removal in openjfx16. It needs to be removed in openjfx17.
- Constructor for class javafx.css.converter.ShapeConverter was deprecated for removal in openjfx16.  It needs to be removed in openjfx17.


Solution
--------

 - Constructor for class javafx.css.Selector is made package scoped as it is only extended by classes in the same package.
 - Constructor for class javafx.css.converter.ShapeConverter is made private as it is a singleton class. No javadoc is needed for this simple private constructor.


Specification
-------------

     abstract public class Selector {
     
         /**
    -     * @deprecated This constructor was exposed erroneously and will be removed in the next version. Use {@link #createSelector(String)} instead.
    +     * Package scoped constructor.
          */
    -    @Deprecated(since="16", forRemoval=true)
    -    public Selector() {
    +    Selector() {
         }
    
     
    public class ShapeConverter extends StyleConverter<String, Shape> {
     
    -    /**
    -     * @deprecated This constructor was exposed erroneously and will be removed in the next version. Use {@link #getInstance()} instead.
    -     */
    -    @Deprecated(since="16", forRemoval=true)
    -    public ShapeConverter() {
    +    private ShapeConverter() {
         }