Improve exception safety with smart pointers

Would you like to wrap any pointer data members with the class template “[std::unique_ptr](https://en.wikipedia.org/wiki/Smart_pointer#unique_ptr "Description for the usage of smart pointers")”?

Update candidates:
- [AIMovementGrid](https://github.com/enginmanap/limonEngine/blob/7592add69db5dd715aaf16f4949ce58f933a3ca2/src/AI/AIMovementGrid.h#L66)
- [TriggerObject](https://github.com/enginmanap/limonEngine/blob/ae78995529acf89aac477d754a2b9090ddabf66b/src/GameObjects/TriggerObject.h#L40)