Avoid future deprecation of setuptools by migrating to pyproject.toml

[paulgeringer]

This should allow the project to continue working past the deprecation of python setup.py.

Build process would be:

python -m build

instead of python setup.py with this change.

Not 100% sure this is really necessary, but at least it gets the framework in place if this seems valuable.

[pfirsich]

For #48 I already started a pyproject.toml. This is what I had:

[build-system]
requires = ["setuptools>=64"]
build-backend = "setuptools.build_meta"

[tool.setuptools.packages.find]
include = ["makelove"]

[project]
name = "makelove"
version = "0.0.14"
dependencies = [
  "Pillow>=7.0",
  "appdirs>=1.4.3",
  "toml>=0.10"
]
requires-python = ">=3.7"
authors = [
  {name = "Joel Schumacher", email = "joelschum@gmail.com"},
  {name = "Josh Perry", email = "joshperry@outlook.com"},
]
maintainers = [
  {name = "Joel Schumacher", email = "joelschum@gmail.com"},
  {name = "Josh Perry", email = "joshperry@outlook.com"},
]
description = "A packaging tool for [löve](https://love2d.org) games"
readme = "README.md"
license = "MIT"
license-files = ["LICENSE"]
classifiers = [
  "Programming Language :: Python :: 3",
  "Operating System :: OS Independent",
  "Topic :: Software Development :: Build Tools",
  "Topic :: Games/Entertainment :: Build Tools",
]

[project.urls]
Repository = "https://github.com/pfirsich/makelove"

[project.scripts]
makelove = "makelove:main"

I think I ran into a problem when verifying that you could still install makelove on all relevant platforms with their default Python versions (Windows, Ubuntu, Fedora, Pop-OS - which is what I use) and there was some issue. It turned out to be a multi-evening thing (even though I started thinking it would just be a few hours), so I dropped it.

If you can list out the Python versions being used (ideally with links so I can verify) and make sure it still cleanly installs on all relevant platforms, I could merge some combined version of our pyproject.tomls. Also please remove the empty files or at least put them in a different commit.