"Chain Berry" 1up-training-like berry

Picking up this berry causes its noded objects (special "seed" type objects) to appear. Remaining on the ground for longer than the natural collection delay while carrying this berry and its seeds will cause the berry and seeds to vanish, returning to its home. Collection of the berry is done by collecting all of its seeds, at which point the berry will autocollect.

*Requested by NeoKat#7298*

Personal note: I've got a fair idea how this is going to work. I think I'll be folding it into Berry Helper in a while (read: when I get around to it), which I'll be able and willing to make available to the collab. I'm just writing this issue so it's on the to-do list so we don't lose it.