Prevents lag caused by large amounts of XP Orbs, for example in mob grinders,
by merging minecraft:experience_orbs which are close together.
To change the maximum distance before orbs will attempt to merge, search
for the word distance in the merge.mcfunction and merge_each.mcfunction
files. By default, the distance defaults to 0.5 blocks, which may be too high
for some uses.
For testing purposes, xopt can be disabled / re-enabled by running the functions
xopt:disable / xopt:enable respectively. You can check the status of xopt
via xopt:status