New feature: log rotation

[cann3v]

It would be cool to add log rotation feature. In some cases, when log files become too large (or irrelevant), they need to be compressed/moved/deleted/something else.
So you can add some optional arguments to logger::init, for example:

• logger::init(logger::debug, logger::cout, "500 MB") for rotation big files;
• logger::init(logger::debug, logger::cout, "12:00") for rotation every noon;
• logger::init(logger::debug, logger::cout, "10 days") for retention old files;
• logger::init(logger::debug, logger::cout, "zip") for compression.