Refactor packaging, part I

Relates to #75 (closed).

Move all project info to pyproject.toml.

Tasks:

• Static Project Info
• Register and run versioneer
• Register Cython extension modules
• Clean up package data files & manifest
• Remove quicktest action from setup.py and realize quicktests some other way -> introduced quicktest.py

Notes:

• The quicktest command in setup.py uses the distutils command interface, but distutils is deprecated since Python 3.10. We must find some other way to realize quicktests.

pyproject.toml

 [project]
 name = "pystencils"
 description = "Speeding up stencil computations on CPUs and GPUs"
-# version: dynamic by versioneer
+dynamic = ["version"]
 readme = "README.md"
 authors = [
     { name = "Martin Bauer" },
@@ -10,7 +10,7 @@ authors = [
     { name = "Frederik Hennig" },
     { email = "cs10-codegen@fau.de" },
 ]
-license = "AGPLv3"
+license = { file = "COPYING.txt" }
 requires-python = ">=3.10"
 dependencies = [
     "sympy>=1.6,<=1.11.1",
@@ -79,3 +79,14 @@ build-backend = "setuptools.build_meta"
 
 [tool.setuptools]
 packages = ["pystencils"]
+
+[tool.versioneer]
+# See the docstring in versioneer.py for instructions. Note that you must
+# re-run 'versioneer.py setup' after changing this section, and commit the
+# resulting files.
+VCS = "git"
+style = "pep440"
+versionfile_source = "pystencils/_version.py"
+versionfile_build = "pystencils/_version.py"
+tag_prefix = "release/"
+parentdir_prefix = "pystencils-"