RFR: 7903727: Remove the reliance on String Templates feature [v5]

[Nizar Benalla]

On Tue, 4 Jun 2024 13:13:41 GMT, Maurizio Cimadamore <mcimadamore at openjdk.org> wrote:

>> This was one of the couple of times where I used MessageFormat, so I had to escape the {
>
> I presume we can just drop the call to `Message::format` here and keep `appendIndentedLines`, right?

Sure, I will do that.
I will try to cover all the suggested fixes in one patch

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PR Review Comment: https://git.openjdk.org/jextract/pull/244#discussion_r1625992079