RFR: 7903347: add long name option for all single letter options and expand help on default values for various options

[Jorn Vernee]

On Fri, 7 Oct 2022 11:12:18 GMT, Athijegannathan Sundararajan <sundar at openjdk.org> wrote:

> * long option names for -I, -l, -D (--include-dir, --library, --define-macro)
> * documented default values for header class name, target package and output directory
> * explanation for -l / --library option.

LGTM. 1 minor nit

README.md line 130:

> 128: #### Command line options
> 129: 
> 130: The `jextract` tool includes several customization options. Users can select in which package the generated code should be emitted, and what the name of the main extracted class should be. If no package is specified, classes are generated in unnamed package. If no name is specified for the main header class, then header class name is

Suggestion:

The `jextract` tool includes several customization options. Users can select in which package the generated code should be emitted, and what the name of the main extracted class should be. If no package is specified, classes are generated in the unnamed package. If no name is specified for the main header class, then the header class name is

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Marked as reviewed by jvernee (no project role).

PR: https://git.openjdk.org/jextract/pull/83