Windows Event Log, error output

Adding more Event Log support, and modifying the loggers so they return
errors in their operational functions.

logging/funcs_linux.go

@@ -24,6 +24,9 @@ var (
 	If prefix is "\x00" (a null byte), then the default logging prefix will be used. If anything else, even an empty string,
 	is specified then that will be used instead for the prefix.
 
+	logConfigFlags is the corresponding flag(s) OR'd for StdLogger.LogFlags / FileLogger.StdLogger.LogFlags if either is selected. See StdLogger.LogFlags and
+	https://pkg.go.dev/log#pkg-constants for details.
+
 	logPaths is an (optional) list of strings to use as paths to test for writing. If the file can be created/written to,
 	it will be used (assuming you have no higher-level loggers available). Only the first logPaths entry that "works" will be used, later entries will be ignored.
 	If you want to log to multiple files simultaneously, use a MultiLogger instead.
@@ -32,10 +35,11 @@ var (
 	If you want to log to multiple Logger destinations at once (or want to log to an explicit Logger type),
 	use GetMultiLogger.
 */
-func GetLogger(enableDebug bool, prefix string, logPaths ...string) (logger Logger, err error) {
+func GetLogger(enableDebug bool, prefix string, logConfigFlags int, logPaths ...string) (logger Logger, err error) {
 
 	var logPath string
 	var logFlags bitmask.MaskBit
+	var currentPrefix string
 
 	// Configure system-supported logger(s).
 	if sysd.Enabled() {
@@ -109,6 +113,7 @@ func GetLogger(enableDebug bool, prefix string, logPaths ...string) (logger Logg
 					StdLogger: StdLogger{
 						Prefix:      logPrefix,
 						EnableDebug: enableDebug,
+						LogFlags:    logConfigFlags,
 					},
 					Path: logPath,
 				}
@@ -116,17 +121,26 @@ func GetLogger(enableDebug bool, prefix string, logPaths ...string) (logger Logg
 				logger = &StdLogger{
 					Prefix:      logPrefix,
 					EnableDebug: enableDebug,
+					LogFlags:    logConfigFlags,
 				}
 			}
 		}
 	}
 
-	logger.Setup()
 	if prefix != "\x00" {
-		logger.SetPrefix(prefix)
+		if err = logger.SetPrefix(prefix); err != nil {
+			return
+		}
+	}
+	if err = logger.Setup(); err != nil {
+		return
 	}
 
-	logger.Info("logger initialized of type %T with prefix %v", logger, logger.GetPrefix())
+	if currentPrefix, err = logger.GetPrefix(); err != nil {
+		return
+	}
+
+	logger.Debug("logger initialized of type %T with prefix %v", logger, currentPrefix)
 
 	return
 }