Fixed Non-Intended Cancellation & Added 2 Modular class to improve the FastInv eco system

[Robotv2]

Hey MrMicky, hope you're doing well.

Fixed non intended cancellation of the own player inventory while using a fast inv inventory, in my case it was useful cause i needed player to be able to drag item from their inventory and drop them into the fastinv inventory.

Also added 2 Modular class, I understand that they can be a little bit redundant so it's up to you if you want to keep them or not.