Add back use of project_name.txt in setup.py

setup.py

@@ -10,7 +10,11 @@ from setuptools import setup, Extension
 from setuptools.command.build_ext import build_ext
 
 
-PROJECT_NAME = "aidge_core"
+def get_project_name() -> str:
+    return open(pathlib.Path().absolute() / "project_name.txt", "r").read().strip()
+
+
+PROJECT_NAME = get_project_name()
 
 SETUP_DIR = pathlib.Path(__file__).parent