Add support for wix files

Adds commonly used wix file extensions. Wix is a toolset for creating msi installers

https://github.com/wixtoolset/wix

Author: Kvan7

identify/extensions.py

@@ -300,11 +300,15 @@
     'wav': {'binary', 'audio', 'wav'},
     'webp': {'binary', 'image', 'webp'},
     'whl': {'binary', 'wheel', 'zip'},
+    'wixproj': {'text', 'xml', 'wix'},
     'wkt': {'text', 'wkt'},
     'woff': {'binary', 'woff'},
     'woff2': {'binary', 'woff2'},
     'wsdl': {'text', 'xml', 'wsdl'},
     'wsgi': {'text', 'wsgi', 'python'},
+    'wxi': {'text', 'xml', 'wix'},
+    'wxl': {'text', 'xml', 'wix'},
+    'wxs': {'text', 'xml', 'wix'},
     'xhtml': {'text', 'xml', 'html', 'xhtml'},
     'xacro': {'text', 'xml', 'urdf', 'xacro'},
     'xcconfig': {'text', 'xcconfig', 'xcodebuild'},