Implement trade system

[JaXt0r]

G1 features a quite complex trade system where you can put single elements or bunch of 10s into a middle slot. Then you need to compensate the amount with the amount from your wares. We need to implement the system in an authentic, but VR modern way.

Pre-conditions

• Talking to NPCs needs to be implemented

TODOs

• a 2D menu should be opening like in G1
• The inventory items from trader and hero needs to be spawned (mesh created) and put into the visible slots
• grabbing items via hands to move them from edges to the center
• close the trade when costs match or were higher only

Hints

• The 2D menu is the afaik easiest way to implement the UI. Feel free to suggest an immersive VR alternative.
• This is a very vague ticket with a lot of open topics to decide. Let's be creative. 🥳