Fix bug: in a PI such as <?test ?pi?>, we got into an incorrect state

on the second ?. This is now properly handled.

src/libStreamedXML/Parser.cpp

@@ -314,9 +314,12 @@ doBuffer:
                 callback->PI(buffer2, buffer);
                 buffer.clear();
                 state = StateNone;
+            } else if(ch == '?') {
+                buffer += L'?';
             } else {
                 buffer += L'?';
                 buffer += ch;
+                state = StatePIData;
             }
             break;