XMLPrinter optimization

Stream writing to buffer will be x5 faster
diff --git a/tinyxml2.h b/tinyxml2.h
index 9774118..316f2ba 100755
--- a/tinyxml2.h
+++ b/tinyxml2.h
@@ -2224,6 +2224,9 @@
 	*/

     virtual void PrintSpace( int depth );

     void Print( const char* format, ... );

+    void Write( const char* data, size_t size );

+    inline void Write( const char* data )           { Write( data, strlen( data ) ); }

+    void Putc( char ch );

 

     void SealElementIfJustOpened();

     bool _elementJustOpened;