Logging system

We are using Go's default logging library. There is basically no configuration and only uses one file. A rolling appender would be useful
- Look around in goland for a better logging library
- Replace the the current solution
- Set up a rolling appender on the server: create a new logfile every day

No files or tests are named. Start by locating the current uses of Go's default logging library and identify how server logs are opened and written. Compare suitable Go logging libraries, then verify that the selected solution supports a new server logfile each day and that existing logging still works.

Written by the indexing model from the issue text.