Fallen Trunk (#2321)

* Register FallenTrunkStructure

* Generate FallenTrunkStructure; place sponge as a placeholder

* Spawn trunk

* Generate log trunk with moss patches, chests, a spawner, and holes

* Make hole's shape a sphere

* Add the small trunk

* Change hole generation algorithm

* Add eroded ends to small trunk; rework the generation of trunk

* Run datagen

* Stop placing spawner outside the chunk

* Fix connection of moss patches

* Fix bounding box of the FallenTrunkStructure

* Replace flowers during the generation of FallenTrunkPiece

* Add mounds(prototype); don't spawn fallen trunks in incorrect biomes; increase the minimal length of the trunk; fix bugs; Add a TerraformingPiece as a temporary solution for bug where mounds get cut by chunk borders

* Fix a bug, where eroded end wasn't generate properly; remove warnings

* Don't create hollow hill functions for every block for fallen trunk's mounds

* Make mounds depend on the radius of the trunk

* Reduce the height of mounds

* Rename variable d for better readability

* Remove magic number

* Fix a bug where a mound could be too close to the ends of its trunk.

* Generate several mounds

* Randomize side of the mounds correctly

* Increase amount of mounds for big trunks

* Comment debugging printHole

* Comment debugging blockEdges

* Refactor moundApex to a constant

* Remove blockEdges form FallenTrunkPiece

* Use random.nextBoolean() for trunk holes

* Reduce copy-paste

* Send blockPos in logger report

* Remove debug function placeBlockEdges

* Change fields from private to protected

* Make the hole a field in FallenTrunkPiece; remove magic number in Hole class

* Avoid generation of big mounds next to trunk holes

* Add support for different trunk rotations in mound generation

* Add zOffset

* Add orientation support correctly

* Call random.next() constant amount of times in placeLog()

* Fix a double rotation bug

* Randomize size of mounds

* Remove unused import

* Run datagen

* Remove debug line

* Use Objects.requireNonNull

* Update error message to direct users to github issues

* Avoid a double compute

* Remove System.out.println

* Add a new loot table for FallenTrunkStructure to exclude magic tree saplings

* Randomize chests positions in FallenTrunkPiece

* Use TWILIGHT_OAK_CHEST instead of vanilla one

* Create chests and a spawner in FallenTrunkPiece with 50% chance

* Remove double chest from FallenTrunkPiece

* Randomize monster in spawner; make SPAWNER_MONSTERS a protected static final field in FallenTrunkPiece

* Simplify possibleChestsOffsets generation

* Return 0 when we calculate mound contribution inside the trunk

* Run datagen

* Fix map-save bug for terraforming piece

* Run datagen

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Co-authored-by: drullkus <drullkus@gmail.com>