Mark single-parameter constructors explicit

Suggested by cppcheck

code/XFileParser.h

@@ -68,7 +68,7 @@ public:
     /** Constructor. Creates a data structure out of the XFile given in the memory block.
      * @param pBuffer Null-terminated memory buffer containing the XFile
      */
-    XFileParser( const std::vector<char>& pBuffer);
+    explicit XFileParser( const std::vector<char>& pBuffer);
 
     /** Destructor. Destroys all imported data along with it */
     ~XFileParser();