added b64 encode/decode to MString.

ZString.h

@@ -434,6 +434,12 @@ namespace coreutils {
       
       bool trimCRLF();
 
+      ///
+      /// Returns the character at the cursor and returns. Cursor is not changed.
+      ///
+
+      char getChar();
+      
       ///
       /// Returns the character at the cursor and advances the cursor one
       /// position until end of data.