CleanupLogger cleans up the logger system before the app exits.

EmergencyLogToFile logs the specified message to the specified file.

GetFuncLogger returns a new logger based on the supplied logger with a string field `func` set to the supplied funcName.

GetLogger returns a new logger with a string field `func` set to the supplied funcName.

GetPackageLogger returns a new logger with a string field `package` set to the supplied packageName.

GetStructLogger returns a new logger with a string field `struct` set to the supplied structname.

InitLogger initializes the logger system.