Add root logging configuration and improve format

Previously no loggers were enabled that concrexit uses. This means that all logs by concrexit code were ignored in production. This commit adds a root logger that will make sure all logs by concrexit and imported packages are logged to the log file.

This commit also improves the 'verbose' logging format, which previously contained unneeded information and less specific information on which package was doing the logging.

Closes #956 (closed) and #957 (closed)