Fixed: Items on ground not reloading when adding new item.
Feature: If the player is closer to an item than 0.8 blocks (and 2.0 blocks vertically), player item drops are cancelled to prevent player item loss (due to minecraft item merging).
Feature: If an item is dropped on the corner of a block that is the neighbour of the ItemStay block AND minecraft merges the original item to the player's item, the item is still unpickupable (the item would become unprotected with ItemStay v1.4).
