emigration: persists last cycle tick so that the behaviour is more consistent with respect to save-and-reloads

Author: master-spike

emigration.lua

@@ -1,6 +1,8 @@
 --@module = true
 --@enable = true
 
+local utils = require('utils')
+
 local GLOBAL_KEY = 'emigration' -- used for state change hooks and persistence
 
 local function get_default_state()