Minor changes to Testing methods

In Config.py:
1. For testing purposes directory for test files is autoamticlly set in
current program directory

In Renpyable:
1. method delete_test_files() also deletes temporary fake directories
2. method create_test_files() checks if fake directories exists and if
they exists method delete_test_files() is called
3. method create_test_files creates temprary fake directories