Migrate to pyproject.toml and scikit-build-core

[mochaaP]

build: switch to scikit-build-core, use gitmodules & peru, clarify license build: use prebuilt Tcl/Tk from CPython, fontconfig from vcpkg on win32 msvc ci: add cibuildwheel and dependabot

Tested on py3.12 Feodra Linux

See changes in https://github.com/TkinterEP/python-tksvg/pull/6

TODO:

• [ ] test runs on macOS & Win32

[rdbende]

Just skimmed through the changes. They mostly look good to me.

fontconfig from vcpkg on win32 msvc

Why is this needed? Extrafont doesn't use fontconfig on Windows, it uses GDI

[mochaaP]

Just skimmed through the changes. They mostly look good to me.

fontconfig from vcpkg on win32 msvc

Why is this needed? Extrafont doesn't use fontconfig on Windows, it uses GDI

Ah I missed that. Will fix it later

[rdbende]

The README mentions it, but I have built extrafont with Visual Studio multiple times, and I can confirm, that fontconfig isn't necessary.

[mochaaP]

cc @rdbende this should be the final changes

[mochaaP]

~~blocked by https://github.com/actions/runner-images/issues/9441~~

edit: applied a workaround as described in https://github.com/TkinterEP/python-tksvg/pull/6#issuecomment-1975166725

[rdbende]

From others' tests this seems to work fine on Windows as well. Let's see how the CI goes.