Alog

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- Support Python 3.9
- Remove Python 3.4 and 3.5 support.

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- Support Python 3.8
- Fix broken ``set_format`` function when formatter argument is given.

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- Renamed:

- ``turn_logging_datetime(on-True)``
- ``turn_logging_thread_name(on-False)``
- ``turn_logging_process_id(on-False)``

- Support most same APIs between alog and Alogger.
- Add ``alog.pdir()`` for handy replacing ``[attr for attr in dir(obj)
if not attr.startswith("_")]``.

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- Fix not able to ``turn_log_datetime(on-False)``.

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- Support not showing_log_datetime by ``turn_log_datetime(on-False)``.

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- Add ``alog.getLogger()`` for handy replacing ``logging.getLogger``.