[REFACTORING] Entity in src

composer.json

core/Controllers/StoreController.php

core/Controllers/UserController.php

core/Models/UserModelAbstract.php

modules/notifications/Models/NotificationModelAbstract.php

src/app/entity/controllers/EntityController.php

src/app/entity/models/EntityModel.php

src/app/entity/models/EntityModelAbstract.php

src/core/controllers/PreparedClauseController.php