RFR: 8252387: Deprecate for removal css Selector and ShapeConverter constructors [v2]

[Bhawesh Choudhary]

> Deprecate the public constructor of javafx.css.Selector as it should not be public due to only being extended by
> classes in same package. Deprecate the public constructor of javafx.css.converter.ShapeConverter as its a singleton
> class.

Bhawesh Choudhary has updated the pull request incrementally with one additional commit since the last revision:

  Updated Selector class comments as per review

-------------

Changes:
  - all: https://git.openjdk.java.net/jfx/pull/290/files
  - new: https://git.openjdk.java.net/jfx/pull/290/files/4719ef18..eb2f71b8

Webrevs:
 - full: https://webrevs.openjdk.java.net/jfx/290/webrev.01
 - incr: https://webrevs.openjdk.java.net/jfx/290/webrev.00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jfx/pull/290.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/290/head:pull/290

PR: https://git.openjdk.java.net/jfx/pull/290