Move the `Core_Shim` trait and the `Refresh_Database` trait from the `Mantle\Testing\TestCase` class. It should only be included on `Mantle\Testkit\TestCase`.
Move the
Core_Shimtrait and theRefresh_Databasetrait from theMantle\Testing\TestCaseclass. It should only be included onMantle\Testkit\TestCase.