Add shebang to python scrips used in the project.

This prevents the wrong interpreter from being used.

generator.py

@@ -1,3 +1,4 @@
+#!/usr/bin/env python3
 import re, os, shutil, string, sys
 
 def generateElements(elementFiles, outputCpp, outputH):

newelement.py

@@ -1,3 +1,4 @@
+#!/usr/bin/env python3
 import sys
 import re
 import os

vsproject.py

@@ -1,3 +1,4 @@
+#!/usr/bin/env python3
 import os
 from pathlib import Path
 import uuid