these files were only kept for backwards compatibility, and aren't actively maintained. They are only needed for legacy conversions in the modern day era.
this has been a bug ever since Snooze was first introduced. The load statistic, similarly to timings, did not account for time spent processing notifications between ticks. The problem is that this is often where a significant amoutn of the load actually comes from, because Snooze is most often activated due to incoming packets.
This change fixes the problem by including the time spent processing notifications since the previous tick in the current tick's usage metric.
this simplifies usages of safe spawns, since the caller doesn't need to know which chunks will be needed for the spawn to be selected.
We'll need this in the future, because safe spawns may also get diverted horizontally as well as vertically, which might require loading adjacent chunks as well as the chunk the position is actually in.
in vanilla, it appears to behave as if the player always clicked on the up face if a block was replaced.
In PM, we were still using the original face, which caused bugs when, for example, placing a button next to a wall by clicking on the side of tallgrass. The button would replace the tallgrass, but stick to the wall, instead of placing itself on the ground like vanilla expects.
This may appear unusual to anyone who also happens to implement canBePlacedAt(), since the facing behaviour will be different. However, this behaviour appears to match vanilla, and even slabs (which I feared might break because of this change) work perfectly.
In the future, it may be desirable to pass some other value here, such as null, to indicate that the clicked block is being replaced. However, that's a BC break and therefore outside of the scope of a stable bug fix.
