Eliminate the ambiguity of "-h" option

[myd7349]

Currently, the "-h" option serves as an alias for both "--headerFile" and "--help" long options, causing ambiguity.

When entering "ClangSharpPInvokeGenerator -h" in the command line, it prompts:

Required argument missing for option: '-h'.

However, entering "ClangSharpPInvokeGenerator --help" outputs the help information correctly.

To eliminate ambiguity, we have three options:

1. Use "-h" as the short version of "--headerFile".

   In this case, since "-h" cannot serve as the short version of "--help" anymore, we cannot rely on the default help message generated by System.Commandline. This aligns with the current behavior of "-h" as well.

2. Use "-h" as the short version of "--help".

   In this case, we must change this line:

   ClangSharp/sources/ClangSharpPInvokeGenerator/Program.cs

   Line 31 in f0501f7

   private static readonly string[] s_headerOptionAliases = ["--headerFile", "-h"];

   either delete the "-h" alias or use a different one(-H or -hf, for example).

   (BTW, if we think -hf is a good option name, should we change the long version to --header-file?)

3. Replace --headerFile to another name, so that we can use a short option which is not -h.

This pull request adopts solution 1. Please let me know if you have any other preferences.

[myd7349]

BTW, this still works:

ClangSharpPInvokeGenerator -c h

[myd7349]

TODO: Update ClangSharpPInvokeGenerator usage in https://github.com/dotnet/ClangSharp/blob/main/README.md#generating-bindings.

[tannergooding]

2 is the better option here, IMO.

-h is a very common shorthand for help and so having --headerFile default to something like -hf is overall less problematic.

[myd7349]

2 is the better option here, IMO.

-h is a very common shorthand for help and so having --headerFile default to something like -hf is overall less problematic.

Hi. Thanks. I will update this PR soon.

[myd7349]

Hi. @tannergooding I have updated the PR.

The usage for ClangSharpPInvokeGenerator in README.md has also been updated to synchronize with the output of --help and -c help.