Windows Event Log, error output

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

logging/errs_windows.go

@@ -0,0 +1,12 @@
+package logging
+
+import (
+	`errors`
+	`fmt`
+)
+
+var (
+	ErrBadBinPath error = errors.New("evaluated binary path does not actually exist")
+	ErrBadPerms   error = errors.New("access denied when attempting to register Event Log source")
+	ErrBadEid     error = errors.New(fmt.Sprintf("event IDs must be between %v and %v inclusive", EIDMin, EIDMax))
+)