Refactor owniverse state management; replace evolution class with state handling and update cycle logic

stage/stage.gd

@@ -244,9 +244,12 @@ func _ready() -> void:
     
 func _process(delta: float) -> void:
     
-    var year_delta: float = owniverse.add_time_delta(delta)
-    set_datetime(year_delta)
-    owniverse.cycle(year_delta)
+    owniverse = owniverse.evolute(delta)
+    set_datetime(owniverse.state.year)
+    
+    owniverse.cycle(delta)
+    
+    #owniverse.cycle_legacy(year_delta)
     
     var actions = _check_counters(delta)
     _do_actions(actions)
@@ -274,7 +277,10 @@ func _page_action_pressed(page_id: int, action_amount: float) -> void:
 
 
 func _change_speed(delta: int) -> void:
-    var speed: int = owniverse.change_speed(delta)
+    
+    owniverse.speed = owniverse.speed + delta
+    
+    var speed: int = owniverse.speed
     var ind: int = 1
     for icon in g_speed_icons:
         if ind <= speed: