flexi_logger_rotate_writer vs flexi_logger vs rat_logger

A custom log writer for emabee's flexi_logger. It is just a simplified version of flexi_logger's FileLogWriter. Simply rotates every day, and stores the logs in files like `foo_r2021-03-28.log`. No cleanup. No other configs.

An easy-to-configure and flexible logger that writes logs to stderr or stdout and/or to files. It allows custom logline formats, and it allows changing the log specification at runtime. It also allows defining additional log streams, e.g. for alert or security messages.

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