Add an updated copy of refill_hotbar.sc

[WesleyJ-128]

The existing refill_hotbar.sc is broken in versions 1.20.5+. This is a fix added as a new script since it is not backwards-compatible.

[gnembon]

I would suggest renaming the old one to _<old_version>, and keeping the always the new one working as with normal name.

[WesleyJ-128]

I've noticed what appears to be a client/server desync bug where the item swapped into the hotbar doesn't appear for the player if the item count is 1— the item is there, and appears once manipulated. I don't know how/if this can be fixed.

[gnembon]

Sorry, but now I am looking at it - the only difference really is in handling of the items of the sboxes. In that case this can be wrapped in a simple if based on major version number similar to
f848906
The scripts don't differ that much besides that nbt handling section
what do you think?

And that would keep one script to handle all versions

[WesleyJ-128]

I like having just one script; I'll look at adding an if statement to combine the two.