RFR: 8332895: Support interpolation for backgrounds and borders [v16]

[Michael Strauß]

On Sun, 4 Aug 2024 22:56:17 GMT, John Hendrikx <jhendrikx at openjdk.org> wrote:

>> Michael Strauß has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   use HashMap.newHashMap()
>
> This is still a large PR, and I do want to help reviewing it, I will do my best to look it over further this week.

@hjohn @andy-goryachev-oracle
I think that I've addressed all comments so far. To summarize the aspects that will not be covered in this PR:
Interpolation for fonts and a wholesale change of cssref (adding a new column for all properties) will be done separately. 
The discussion about a place to collect JEP-style design documents is not resolved yet, and will also be done separately.
Do you think there is anything left preventing this PR from moving forward?

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PR Comment: https://git.openjdk.org/jfx/pull/1522#issuecomment-2324600126