Python virtual environment (#3305)

* [python] setup venv and update pprzlink.
* [supervision] open terminal in the venv if it exists.
* clean setup.py
* guard venv boostrap
* [install] Use distro instead of lsb_release.

---------

Co-authored-by: Fabien-B <Fabien-B@github.com>

setup.py

@@ -0,0 +1,49 @@
+import venv
+import os
+import sys
+import subprocess
+import argparse
+import shutil
+
+ENV_NAME = 'pprzEnv'
+
+
+def run(args):
+    if args.clean:
+        if os.path.exists(ENV_NAME):
+            print("Cleaning previous venv.")
+            shutil.rmtree(ENV_NAME)
+        else:
+            print("No previous venv to clean.")
+
+    print("Creating a virtual environment for Paparazzi...")
+    venv.create(ENV_NAME, with_pip=True, system_site_packages=args.system)
+
+    # installing requirements
+    cmd = [f'./{ENV_NAME}/bin/pip', 'install', '-r' , 'requirements.txt']
+    result = subprocess.run(cmd, check=False)
+    if result.returncode:
+        print("Failed to create venv!")
+    else:
+        print("venv successfully created.")
+
+    # installing pprzlink
+    print("Installing pprzlink...")
+    cmd = [f'./{ENV_NAME}/bin/pip', 'install', '-e' , 'sw/ext/pprzlink/lib/v2.0/python']
+    result = subprocess.run(cmd, check=False)
+    if result.returncode:
+        print("Failed to install pprzlink!")
+    else:
+        print("pprzlink successfully installed.")
+    
+    if not os.path.exists(f'./{ENV_NAME}/bin/calibrate.py'):
+        os.symlink('../../sw/tools/calibration/calibrate.py', f'./{ENV_NAME}/bin/calibrate.py')
+
+
+if __name__ == "__main__":
+    parser = argparse.ArgumentParser(description="This script will setup the python environment for Paparazzi")
+    parser.add_argument('-s', '--system', action='store_true', help="Use system site packages.")
+    parser.add_argument('-c', '--clean', action='store_true', help="Delete the previous virtual environment before recreating it.")
+    args = parser.parse_args()
+
+    run(args)