Windows Event Log, error output

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

logging/consts_windows.go

@@ -3,7 +3,6 @@ package logging
 import (
 	`os`
 	`path/filepath`
-	`regexp`
 
 	`r00t2.io/goutils/bitmask`
 )
@@ -28,8 +27,21 @@ var (
 	}
 )
 
-// ptrnSourceExists is a regex pattern to check for a registry entry (Event Log entry) already existing.
-var ptrnSourceExists *regexp.Regexp = regexp.MustCompile(`registry\skey\salready\sexists$`)
+/*
+	ptrnSourceExists is a regex pattern to check for a registry entry (Event Log entry) already existing.
+
+	Deprecated: this is handled differently now.
+*/
+// var ptrnSourceExists *regexp.Regexp = regexp.MustCompile(`registry\skey\salready\sexists$`)
+
+const (
+	EIDMin uint32 = 1
+	EIDMax uint32 = 1000
+)
+
+const (
+	eventLogRegistryKey string = "SYSTEM\\CurrentControlSet\\Services\\EventLog\\Application"
+)
 
 // Default WinEventID, (can be) used in GetLogger and MultiLogger.AddWinLogger.
 var DefaultEventID *WinEventID = &WinEventID{