Merge branch 'pyproject' into 'master'

Updated project distribution to use pyproject.toml

See merge request !137

pyproject.toml

+[build-system]
+requires = [
+    "wheel",
+    "setuptools",
+    "numpy",
+    "Cython>=0.21.1"
+]
+build-backend = "setuptools.build_meta"

setup.py

@@ -838,8 +838,6 @@ def get_project_configuration(dry_run):
         # for the script launcher
         "setuptools"]
 
-    setup_requires = ["setuptools", "numpy", "Cython>=0.21.1"]
-
     extras_require = {
         "gui": ["PyOpenGL", "matplotlib", "PyQt5"]
     }
@@ -888,7 +886,6 @@ def get_project_configuration(dry_run):
                                     "Calculation Software",
                         long_description=get_readme(),
                         install_requires=install_requires,
-                        setup_requires=setup_requires,
                         extras_require=extras_require,
                         cmdclass=cmdclass,
                         package_data=package_data,