sagemathgh-37810: build/pkgs/gambit: Remove
    
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Removing this broken experimental package, as proposed in 2020.
- Closes sagemath#30156

Also removing the module providing outdated "standalone instructions" to
use Gambit.

Keeping the various references to Gambit tagged with `# optional -
gambit`. This will be updated in the follow-up PR"
- sagemath#37809


The motivation for opening this PR to remove `gambit` now (2024) is that
it removes a remaining use of the function `sdh_setup_bdist_wheel` (the
old gambit Python package could not be installed using pip). This a step
for the modernization of the build frontend for Python packages in the
Sage distribution:
- sagemath#35618

### 📝 Checklist

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- [x] The title is concise and informative.
- [x] The description explains in detail what this PR is about.
- [x] I have linked a relevant issue or discussion.
- [ ] I have created tests covering the changes.
- [ ] I have updated the documentation and checked the documentation
preview.

### ⌛ Dependencies

<!-- List all open PRs that this PR logically depends on. For example,
-->
<!-- - sagemath#12345: short description why this is a dependency -->
<!-- - sagemath#34567: ... -->
    
URL: sagemath#37810
Reported by: Matthias Köppe
Reviewer(s): John H. Palmieri

sagemathgh-37810: build/pkgs/gambit: Remove
    
<!-- ^ Please provide a concise and informative title. -->
<!-- ^ Don't put issue numbers in the title, do this in the PR
description below. -->
<!-- ^ For example, instead of "Fixes sagemath#12345" use "Introduce new method
to calculate 1 + 2". -->
<!-- v Describe your changes below in detail. -->
<!-- v Why is this change required? What problem does it solve? -->
<!-- v If this PR resolves an open issue, please link to it here. For
example, "Fixes sagemath#12345". -->

Removing this broken experimental package, as proposed in 2020.
- Closes sagemath#30156

Also removing the module providing outdated "standalone instructions" to
use Gambit.

Keeping the various references to Gambit tagged with `# optional -
gambit`. This will be updated in the follow-up PR"
- sagemath#37809


The motivation for opening this PR to remove `gambit` now (2024) is that
it removes a remaining use of the function `sdh_setup_bdist_wheel` (the
old gambit Python package could not be installed using pip). This a step
for the modernization of the build frontend for Python packages in the
Sage distribution:
- sagemath#35618

### 📝 Checklist

<!-- Put an `x` in all the boxes that apply. -->

- [x] The title is concise and informative.
- [x] The description explains in detail what this PR is about.
- [x] I have linked a relevant issue or discussion.
- [ ] I have created tests covering the changes.
- [ ] I have updated the documentation and checked the documentation
preview.

### ⌛ Dependencies

<!-- List all open PRs that this PR logically depends on. For example,
-->
<!-- - sagemath#12345: short description why this is a dependency -->
<!-- - sagemath#34567: ... -->
    
URL: sagemath#37810
Reported by: Matthias Köppe
Reviewer(s): John H. Palmieri

sagemathgh-38201: Replace uses of `setup.py bdist_wheel` and direct uses of `python3 -m build`
    
<!-- ^ Please provide a concise and informative title. -->
<!-- ^ Don't put issue numbers in the title, do this in the PR
description below. -->
<!-- ^ For example, instead of "Fixes sagemath#12345" use "Introduce new method
to calculate 1 + 2". -->
<!-- v Describe your changes below in detail. -->
<!-- v Why is this change required? What problem does it solve? -->
<!-- v If this PR resolves an open issue, please link to it here. For
example, "Fixes sagemath#12345". -->

This is the next step in the modernization of our use of build front
ends for Python SPKGs, after sagemath#35618.

- New `sage-dist-helper` functions `sdh_build_wheel`,
`sdh_build_and_store_wheel` (split out from sagemath#36730)
- New option `--sdist-then-wheel` for `sdh_pip_install` (and the new
`sdh_build*wheel` functions)

By switching the packages `sagemath_environment` etc. from direct use of
`python3 -m build` to the `sdh_build_and_store_wheel` script, it now
falls back to `--no-build-isolation` when building with build isolation
fails.
- This fixes sagemath#38190

### 📝 Checklist

<!-- Put an `x` in all the boxes that apply. -->

- [x] The title is concise and informative.
- [ ] The description explains in detail what this PR is about.
- [ ] I have linked a relevant issue or discussion.
- [ ] I have created tests covering the changes.
- [ ] I have updated the documentation and checked the documentation
preview.

### ⌛ Dependencies

<!-- List all open PRs that this PR logically depends on. For example,
-->
<!-- - sagemath#12345: short description why this is a dependency -->
<!-- - sagemath#34567: ... -->
    
URL: sagemath#38201
Reported by: Matthias Köppe
Reviewer(s):