[cpp-qt5] Qt5 PetStore sample failed to compile

Created by: etherealjoy

Description

On master the Petstore sample after being generated with the script does not compile. Just compile the repo and run script and then try to compile the code in Qt Creator

openapi-generator version

3.0.0

Suggest a fix/enhancement

• Missing Includes for shared_ptr
• Migration to shared pointer without updating the pointer accessor
• Duplicate padding of OAI for example OAIOAIPet