Live-update preview on type

TODO

@@ -1,9 +1,5 @@
-- arithmatic
+- finish event listener:
 
-- path to event listener:
-
-  - rerender w/ a signal to branch into handler
-  - capture correct position information in script blocks
   - card fields (vars maybe not needed yet?)
     - set field command
       - buffer output/side-effects in VM
@@ -11,6 +7,11 @@
         - unit test
       - command
       - set field inline instead of separate data???
+  - capture correct position information in script blocks
+
+- arithmatic
+
+- if blocks
 
 - impl vars