Switch to modern Python build system

Remove setuptools and use pyproject.toml instead.

client-cli/pyproject.toml

@@ -0,0 +1,21 @@
+[build-system]
+requires = ["setuptools", "wheel"]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "pvc"
+version = "0.9.107"
+dependencies = [
+    "Click",
+    "PyYAML",
+    "lxml",
+    "colorama",
+    "requests",
+    "requests-toolbelt",
+]
+
+[tool.setuptools]
+packages = ["pvc.cli", "pvc.lib"]
+
+[project.scripts]
+pvc = "pvc.cli.cli:cli"

client-cli/setup.py

@@ -1,20 +0,0 @@
-from setuptools import setup
-
-setup(
-    name="pvc",
-    version="0.9.107",
-    packages=["pvc.cli", "pvc.lib"],
-    install_requires=[
-        "Click",
-        "PyYAML",
-        "lxml",
-        "colorama",
-        "requests",
-        "requests-toolbelt",
-    ],
-    entry_points={
-        "console_scripts": [
-            "pvc = pvc.cli.cli:cli",
-        ],
-    },
-)