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.

ui/indicators/world_indicators.gd

@@ -34,7 +34,7 @@ func update(world) -> void:
     var source: Dictionary = world.state
     var energy: float = clampf(source.energy / Parameters.INITIAL_ENERGY, 0.0, 1.0)
     for bar in energy_bars: bar.scale.x = energy
-    var density_value: float = world.stellar_environment(source).density
+    var density_value: float = world.environment.stellar_environment(source).density
     var density: Dictionary = Parameters.density_display(density_value)
     warning_border.self_modulate = Parameters.density_warning_color(density_value)
     for indicator in density_indicators: