feat: Add transformation to Python and a menu item to call it

trans/python.str

@@ -0,0 +1,25 @@
+module python
+
+imports
+  
+  signatures/-
+
+rules
+  
+  // Generate python code from AST:
+  to-python:
+    Program(x, y) -> $[ print( [x'] + ',', [y'] ) ]
+    where
+      x' := <to-python> x
+    ; y' := <to-python> y
+  
+  to-python:
+  	Hello() -> $[ "Greetings" ]
+  	
+  to-python:
+  	World() -> $[ "Earth" ]
+  	
+  // Interface python code generation with editor services and file system
+  generate-python: (selected, _, _, path, project-path) -> (filename, result)
+    with filename := <guarantee-extension(|"py")> path
+       ; result   := <to-python> selected

trans/spoofax_helloworld.str

@@ -6,6 +6,7 @@ imports
   pp
   outline
   analysis
+  python
 
 rules // Debugging