RFR: 8332416: Add more font selection options to Font2DTest [v2]

[Phil Race]

> Enhance Font2DTest as follows
> 
> - Add main menu Radio Button options so that you select the font to use as either
> - (1) Font Family  + Style (as now)
> - (2) Font Family + Menu of all members of the Family, replacing the Style
> - (3) List of all fontnames - which can still be adjusted by Style if you want.
> The default is (1) so nothing looks different except that I updated the UI to use Nimbus instead of Metal.
> 
> There's new code to gather these ways of referencing the fonts.
> Also changes were needed for the "Save/Load" options to include the new UI state and font settings.

Phil Race has updated the pull request incrementally with one additional commit since the last revision:

  8332416

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/19273/files
  - new: https://git.openjdk.org/jdk/pull/19273/files/0fc0e271..9721de23

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=19273&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=19273&range=00-01

  Stats: 4 lines in 1 file changed: 0 ins; 4 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/19273.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19273/head:pull/19273

PR: https://git.openjdk.org/jdk/pull/19273