Add core simulation modules for owniverse mechanics

- Introduced `life_evolution.gd` to manage life evolution processes.
- Implemented `manual_production.gd` for handling production mechanics, including resource management and production steps.
- Created `object_batches.gd` to manage batches of objects, including scaling and appending batches.
- Developed `object_ledger.gd` for tracking physical amounts, available resources, and binding ownerships.
- Added `simulation_module.gd` as a base class for simulation modules, providing a weak reference to the world.
- Established `stellar_rules.gd` for managing stellar evolution and destruction mechanics.
- Introduced `universe_environment.gd` to calculate environmental parameters based on the current state of the universe.

tests/test_batch_boundaries.gd

@@ -17,21 +17,21 @@ func fixture():
     var global: Node = root.get_node("Global")
     for id in global.OwniverseEntities:
         var entity = load("res://world/owniverse/owniverse_entity.gd").new(global.OwniverseEntities[id])
-        world.entities[id] = entity
+        world.catalog.entities[id] = entity
         world.state.amount[id] = 0.0
         world.state.stats.total_amount[id] = 0.0
         if entity.group_as != "":
             world.state.amount[entity.group_as] = 0.0
             world.state.stats.total_amount[entity.group_as] = 0.0
-    world.entities["N"].life_product = {}
-    world.entities["N"].product_per_year_type = "H"
-    world.entities["N"].product_per_year_amount = 10.0
-    world.entities["N"].auto = 0.0
+    world.catalog.entities["N"].life_product = {}
+    world.catalog.entities["N"].product_per_year_type = "H"
+    world.catalog.entities["N"].product_per_year_amount = 10.0
+    world.catalog.entities["N"].auto = 0.0
     world.state.amount.N = 1.0
     return world
 
 func dispose(world) -> void:
-    for entity in world.entities.values():
+    for entity in world.catalog.entities.values():
         entity.free()
     world.free()
 
@@ -41,7 +41,7 @@ func run() -> void:
     var boundary: float = 41215289.79999999701976776
     for interval in [[boundary - 2.5, boundary + 2.25], [boundary, boundary + 2.0]]:
         world.state.batches.LGRB = []
-        world._append_batch(world.state, "LGRB", 100.0, interval[0], interval[1])
+        world.batches.append_batch(world.state, "LGRB", 100.0, interval[0], interval[1])
         var total: float = 0.0
         var last: float = -INF
         for batch: Dictionary in world.state.batches.LGRB: