[python] Fix shebangs to use the "right" interpreter. (#3292)

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

doc/sphinx/source/tutorials/interfacing_with_paparazzi.rst

@@ -28,7 +28,7 @@ This python example shows the reception and emission of messages. For the recept
 .. code-block:: python
     :linenos:
 
-    #!/usr/bin/python3
+    #!/usr/bin/env python3
     import sys
     import time
     import os

doc/sphinx/source/user_guide/shapes_example.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python3
+#!/usr/bin/env python3
 
 import sys
 from os import path, getenv

paparazzi

@@ -1,4 +1,4 @@
-#!/usr/bin/env /usr/bin/python3
+#!/usr/bin/env python3
 
 import os
 import sys

sw/ground_segment/python/anemometer_PCE423.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python3
+#!/usr/bin/env python3
 #
 # This file is part of PPRZLINK.
 # 

sw/ground_segment/python/udp_link/datalink_to_w5100.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python3
 
 from __future__ import print_function
 import os

sw/ground_segment/python/udp_link/proxy_udp_multicast_to_link.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python3
 
 from __future__ import print_function
 import os

sw/logalizer/log_extract.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python3
+#!/usr/bin/env python3
 import sys
 from collections import namedtuple
 from pyproj import CRS, Proj

sw/logalizer/rt_plotter.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python3
+#!/usr/bin/env python3
 import sys
 import signal
 import re

sw/supervision/python/paparazzicenter.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python3
+#!/usr/bin/env python3
 # Copyright (C) 2008-2022 The Paparazzi Team
 # released under GNU GPLv2 or later. See COPYING file.
 import os

sw/tools/attitude_viz.py

@@ -1,4 +1,4 @@
-#! /usr/bin/python
+#! /usr/bin/env python3
 
 # Tool for visualizing quaternion as rotated cube
 

sw/tools/find_vpaths.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python3
 #This Python script generates a list of source files.
 #It finds the correct VPATH to each source file from make, and then feeds all info to gcc -MM.
 import sys

sw/tools/process_exif/process_exif.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python3
 #
 #       <message NAME="DC_SHOT" ID="110">
 #        <field TYPE="int16" NAME="photo_nr"/>

sw/tools/px4/print_message.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python3
+#!/usr/bin/env python3
 # temporary solution to print a message to reconnect the usb cable
 #At some point hopefully this can be automated (without replugging)
 print("\n ")

sw/tools/qt_project.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python3
 import sys
 import re
 from os import path, getenv

sw/tools/rtp_viewer/rtp_viewer.py

@@ -1,4 +1,4 @@
-#! /usr/bin/python
+#! /usr/bin/env python3
 
 import cv2
 import sys