RFR: 8356978: Convert unicode sequences in Java source code to UTF-8

[Phil Race]

On Wed, 14 May 2025 14:29:23 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

> After we converted the source base to be fully UTF-8, we do not need to use unicode sequences (like \u0123) in string literals. Sometimes, that might still make sense, as for control characters, non-breaking space, etc. But for strings that is supposed to be a coherent text in a language that needs non-ASCII parts of Unicode, this is not so. Instead, having the sequences makes the text just harder to read and edit. We have already removed several such sequences before, but some remains.

Just speaking for the one client demo.
Someone else will need to review the other 98% of this PR

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Marked as reviewed by prr (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/25229#pullrequestreview-2862613813