[1.21] Update inventory logic to work with ContainerClick packet #698
Description
1.21 changed the ContainerClick packet to not contain the itemcomponents of the transferred item, but just a hash.
https://minecraft.wiki/w/Java_Edition_protocol/Packets#Click_Container
Therefore we need to make sure that we can figure out what/where the original item(s) are + what components they have so we properly simulate the item movement so our server is not desynced.
I believe depending on how reliable the packet itself is (the packet contains a list of new slots; So if we can reliably understand what items moved to what new position, we can easily figure out the components).
The underlying hashing used in the new packet might not be required for this depending on how good the server side inventory simulation is => can we reliably figure out the full movement of slot A to slot B based on the packet?