Fix script loading with Godot 4.3

Fixes various issue that came from Godot 4.3 changes in GDScript and loading:
#196 #187

addons/pandora/model/type.gd

@@ -73,8 +73,12 @@ static func lookup(name: String) -> PandoraPropertyType:
 
 	if ResourceLoader.exists(type_path):
 		var ScriptType = load(type_path)
-		if ScriptType != null and ScriptType.has_source_code():
-			return ScriptType.new()
+		if ScriptType != null:
+			if Engine.is_editor_hint() and ScriptType.has_source_code():
+				return ScriptType.new()
+		else:
+			if ScriptType.can_instantiate():
+				return ScriptType.new()
 
 	return UndefinedType.new()
 

addons/pandora/util/script_util.gd

@@ -39,7 +39,7 @@ static func create_entity_from_script(
 
 static func _get_entity_class(path: String) -> GDScript:
 	var EntityClass = load(path)
-	if EntityClass == null:
+	if EntityClass == null or not EntityClass.can_instantiate():
 		push_warning("Unable to find " + path + " - defaulting to PandoraEntity instead.")
 		EntityClass = PandoraEntityScript
 	return EntityClass