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.

export_presets.cfg

@@ -110,7 +110,7 @@ architectures/armeabi-v7a=false
 architectures/arm64-v8a=true
 architectures/x86=false
 architectures/x86_64=false
-version/code=124
+version/code=123
 version/name=""
 package/unique_name="com.KIDGameProduction.Owniverse"
 package/name="Owniverse"