feat: configuration support (#684)

* feat: configuration support

* refactor: include manylinux, minor redesign

* "project global" overrides "default platform"

This allows overriding `repair-wheel-command` in the `[tool.cibuildwheel.global]` section.

* fix: add PyPy images

* refactor: remove global

* fix: support tables and arrays

* docs: add pyproject.toml config to docs

* docs: updates based on feedback

* fix: only join if sensible

* refactor: remove manylinux dict

* docs: examples headers and sections on each

* feat: support changing the config from the command line

* fix: use {package}

* tests: add a few tests and mention config one more place

* Restyle examples tabs to remove indent

* Unrelated docs improvements

* Absorb extra content into the tab

* Make the tabs smaller and to the right

* Copy edits to options

* Fix header ids

* Use fewer [tool.cibuildwheel] headers

* docs: minor additions/fixes

* feat: disallow options on some platforms

* docs: make the examples a tiny bit more tabby

* fix: enforce tables/lists are optionally separate

* Some unrelated fixes to the other tab styling

* Minor fix to tab styling

* Refactor to make code a bit more linear and immutable

* Minor docs changes

Co-authored-by: mayeut <mayeut@users.noreply.github.com>
Co-authored-by: Joe Rickerby <joerick@mac.com>

unit_test/main_tests/main_options_test.py

@@ -200,7 +200,7 @@ def test_test_command(
 
     main()
 
-    assert intercepted_build_args.args[0].test_command == test_command
+    assert intercepted_build_args.args[0].test_command == (test_command or "")
 
 
 @pytest.mark.parametrize("before_build", [None, "before --build"])
@@ -217,7 +217,7 @@ def test_before_build(
 
     main()
 
-    assert intercepted_build_args.args[0].before_build == before_build
+    assert intercepted_build_args.args[0].before_build == (before_build or "")
 
 
 @pytest.mark.parametrize("build_verbosity", [None, 0, 2, -2, 4, -4])
@@ -286,7 +286,4 @@ def test_before_all(before_all, platform_specific, platform, intercepted_build_a
 
     main()
 
-    if before_all is None:
-        before_all = ""
-
-    assert intercepted_build_args.args[0].before_all == before_all
+    assert intercepted_build_args.args[0].before_all == (before_all or "")