Harmonize shebangs and encoding info

- Use `#!/usr/bin/env python3` on executable modules
- Remove shebangs on all other `.py` files
- Add UTF-8 encoding info where mising

setup.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python3
+#!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 
 import os

src/wireviz/DataClasses.py

@@ -1,4 +1,3 @@
-#!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 
 from typing import Dict, List, Optional, Tuple, Union

src/wireviz/Harness.py

@@ -1,4 +1,3 @@
-#!/usr/bin/env python
 # -*- coding: utf-8 -*-
 
 from graphviz import Graph

src/wireviz/__init__.py

@@ -1,3 +1,4 @@
+# -*- coding: utf-8 -*-
 # Please don't import anything in this file to avoid issues when it is imported in setup.py
 
 __version__ = '0.3-dev'

src/wireviz/build_examples.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python3
+#!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 
 import argparse

src/wireviz/wv_bom.py

@@ -1,4 +1,3 @@
-#!/usr/bin/env python
 # -*- coding: utf-8 -*-
 
 from dataclasses import asdict

src/wireviz/wv_colors.py

@@ -1,4 +1,3 @@
-#!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 
 from typing import Dict, List

src/wireviz/wv_gv_html.py

@@ -1,4 +1,3 @@
-#!/usr/bin/env python
 # -*- coding: utf-8 -*-
 
 from typing import List, Optional, Union

src/wireviz/wv_helper.py

@@ -1,4 +1,3 @@
-#!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 
 from typing import List

src/wireviz/wv_html.py

@@ -1,4 +1,3 @@
-#!/usr/bin/env python
 # -*- coding: utf-8 -*-
 
 from pathlib import Path