RFR: 8314: Update some important copyrights [v3]

[Alex Macdonald]

On Wed, 15 Jan 2025 18:12:15 GMT, Marcus Hirt <hirt at openjdk.org> wrote:

>> Also added some missing project files to make life easier in Eclipse.
>
> Marcus Hirt has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Aaargh copyright

Marked as reviewed by aptmac (Reviewer).

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PR Review: https://git.openjdk.org/jmc/pull/621#pullrequestreview-2553556187