[Issue 15536] [std.experimental.logger] More detailed example for custom logger implementation

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=15536

--- Comment #3 from Arun Chandrasekaran <aruncxy at gmail.com> ---
I'm not against custom logger implementation, however, I think this can be
achieved with a function that accepts a log pattern, globally and per logger.

Something like this:

%t = thread-id
%T = timestamp
%l = log level
%m = log message

logger.setPattern("%t %T %l %m") would result in log message as follows.

2019-04-26 10:51:22.876 083892 info Some stuff.

This will make it very flexible.

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