Add new entity and item definitions, refactor related code

- Introduced new CSV files for entities and items, defining various properties and characteristics.
- Refactored the stage.gd script to handle item selection and descriptions instead of entities.
- Updated item button script to reflect changes in item properties and signals.
- Created a new entity.gd script to define the OwniverseEntity class with initialization and parsing methods.
- Modified owniverse.gd to initialize entities from the new definitions.
- Adjusted versioning in export presets and project files to reflect recent changes.

world/owniverse.gd

@@ -4,7 +4,15 @@ class_name Owniverse
 var g_datetime: float = 0
 var g_speed: int = 1
 var g_speed_in_years = 1
-    
+
+var g_entities: Dictionary[String, OwniverseEntity] = {}
+
+func init_enitities() -> void:
+    for entity_id in Global.OwniverseEntities:
+        var entity = OwniverseEntity.new()
+        entity.init_entity(Global.OwniverseEntities[entity_id])
+        g_entities[entity_id] = entity
+
 func add_time_delta(delta) -> float:
     var year_delta:float = delta * g_speed_in_years