RFR: 8208761: Update constant collections to use the new immutable collections

[Kevin Rushforth]

On Sun, 2 Feb 2020 00:15:02 GMT, Nir Lisker <nlisker at openjdk.org> wrote:

> Resubmitting from before the transition to this repo. See linked issue for details.

Given the large number of changes, I'd like two reviewers to look it over for any possible typos.

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

PR: https://git.openjdk.java.net/jfx/pull/104