Improve logging: log file rotation, log exception stack trace and more

[adadurov]

Improve logging to files:

• log file rotation
• log exception stack trace
• log timestamp with milliseconds
• log message level (ERROR, TRACE, DEBUG, INFO etc.)
• prepare to log asynchronously

[xaoseric]

@adadurov Perhaps take a look at NLog in #19, the file log rotation handling is built into it

https://github.com/NLog/NLog/wiki/File-target

[adadurov]

@adadurov Perhaps take a look at NLog in #19, the file log rotation handling is built into it

https://github.com/NLog/NLog/wiki/File-target

Thank you, @xaoseric, I know about NLog and other logging solutions. I also understand that the logging implementation here is very basic, looking more like a PoC, so I wanted to contribute my 2 cents to the PoC. But I may be wrong in my understanding or assumptions.