Rewrites the Threaded task logic to no longer use 2 queues and instead
keep a single prioritized queue and do all of a chunks light tasks in a single batch
Fix a math issue in one place (Thankfully didn't seem to really be a common place since didn't notice anything)
Fix bug where mojang has a -90 modifier in yaw resulting in us calculating
chunks to the players left rather than in front of them.
Drastically improve Frustum Prioritization function to reduce lag from its
calculations (Found it was being spammed really heavy on world add/teleport)
Also improved the logic behind choosing chunks to prioritize.
Add Priority tickets to a radius of 3 on any login, world chnge or teleport
This should help improve world load / chunk sending upon a player changing
locations by loading those chunks faster.
Improved the Player Ticket Delayer to be a little bit smarter about delays to
let closer chunks load a bit faster and only delay the farther out ones more.
This update will provide significant improvements to priority of chunks and
reduce the cpu cost of doing these calculations.
Fixes#3530
In previous MC versions, we had a rather simple internal scheduler
for delayed tasks that would just keep pushing task back until desired
tick was reached.
The method it called to schedule the task changed behavior in 1.14, and now
this scheduler is not working nowhere near what it was supposed to be doing.
This was causing long delayed task to eat up CPU (In Oversleep for example)
Rewrite this to just use the CraftScheduler for scheduling delayed tasks.
Once this was fixed, it became quite clear the code that delayed ticket
additions for chunks based on distance was clearly not right, as it was
tested on the previous broken logic.
So the ticket delay process has been vastly revamped to be even smarter.
Chunks behind the player can load slower than the chunks in front of the player.
We also can delay ticket adding until one of its neighbors has loaded, as
this lets us get a smoother spiral out for the chunks (minus frustum intent).
Additionally on frustum previous commit inadvertently broke frustum trying to
fix an issue when the real fix lied elsewhere, so restore chunk priority so
it works again.
Upon further knowledge of the system, it is known that region files
are closing properly, as well as this didn't help native memory use anyways.
This patch also caused issues compiling on a newer JDK being able to
release the jar to java 8 users.
