Summary
-------

Deprecate the public constructor of javafx.css.Selector and javafx.css.converter.ShapeConverter

Problem
-------

 - Constructor for class javafx.css.Selector should not be public as it
   is only extended by classes in same package.
 - Constructor for class javafx.css.converter.ShapeConverter should not
   be public as its a singleton class.

Solution
--------

 Deprecate the constructor of both class javafx.css.Selector and javafx.css.converter.ShapeConverter for removal.

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

    /**
     * @deprecated This constructor was exposed erroneously and will be removed in the next version. Use {@link #createSelector(String)} instead.
     */
    @Deprecated(since="16", forRemoval=true)
    public Selector() {
    }

    /**
     * @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() {
    }