Add support for extensions parameters

Still experimental

extensions/example/script.py

@@ -1,14 +1,18 @@
+params = {
+    "input suffix": " *I say as I make a funny face*",
+}
+
 def input_modifier(string):
     """
     This function is applied to your text inputs before
     they are fed into the model.
     """ 
 
-    return string.replace(' ', '#')
+    return string + params["input suffix"]
 
 def output_modifier(string):
     """
     This function is applied to the model outputs.
     """
 
-    return string.replace(' ', '_')
+    return string