Update DevNotes with further refactoring tasks

Added a note about removing location from CPUState and tracking it through Organism.

Author: anyaevostinar

source/sgp_mode/DevNotes.md

@@ -1,6 +1,7 @@
 (delete once Anya is done with joint refactoring)
 
 ## Further refactoring list:
+* Remove location from CPUState and have it rely on Organism location instead of maintaining separately and generally trace through to make sure it is tracked cleanly
 * Add SGP mode to API reference doc
 * Move ProcessSymOutputBuffer into SGPSymbiont to parallel host
 * Move SymDoMutation into SGPSymbiont to parallel host
@@ -95,4 +96,4 @@ These are function flows that are complicated to follow:
 [ ] Port Multi infection code from Elias fork
 [ ] Finish implementation of temporally changing environment
 [ ] Make sure spatial structure is working?
-[ ] Go back through for other refactoring todos
+[ ] Go back through for other refactoring todos