New inventory system (WIP) (Patreon)

I have promised a new inventory system, It was about time to retire the old one and create something more robust.
This one is very extendable and should be easy to both use and customize, I've been experimenting with inventory systems for a while and wrote this one to have all of the features that I've been developing. I'm specially proud of my new approach to solving the multiple bags problems.
I will be adding more on top of it like shopping, chests and loot tables. Hopefully it becomes the only system you'll ever need to manage all of your item related needs.
Download the code from the attachments and give it a try