Adding the ability to register a single script using the "script" attribute at the map property level.

maps/tests/script.js

@@ -0,0 +1,8 @@
+console.log('SCRIPT LAUNCHED');
+WA.sendChatMessage('Hi, my name is Poly and I repeat what you say!', 'Poly Parrot');
+
+
+WA.onChatMessage((message => {
+    console.log('CHAT MESSAGE RECEIVED BY SCRIPT');
+    WA.sendChatMessage('Poly Parrot says: "'+message+'"', 'Poly Parrot');
+}));