Usage:
from state_saver import SourceSaver
    SourceSaver(target_dir='test_saving', 
        extensions_filter=['py', 'txt'], 
        include_subdirs=True,
        basic_folder_identifier="KorBaby__",
        saver_folder_datetime_format="%Y%m%d",
        avoid_saving_already_saved_files=True,
        whitelist_filenames=['damn.tx'],
        blacklist_filenames=['saver.py'])