Address SonarLint findings in XmlParseMode class

include/ls-std/io/xml/XmlParseMode.hpp

@@ -3,7 +3,7 @@
  * Company:         Lynar Studios
  * E-Mail:          webmaster@lynarstudios.com
  * Created:         2020-10-13
- * Changed:         2023-02-04
+ * Changed:         2023-05-18
  *
  * */
 
@@ -12,7 +12,7 @@
 
 namespace ls::std::io
 {
-  enum XmlParseMode
+  enum class XmlParseMode
   {
     XML_PARSE_MODE_ANALYZE = 0,
     XML_PARSE_MODE_DECLARATION,