Implement generator for Bastion Remnants

[MCMDEV]

One of the more complicated structures that consist of multiple pieces.
Would be nice to have so it can be integrated into Minemap and so on.
An abstract generator for structures using StructurePools would probably simplify the process for new structures in the future even more. This could be based on the already existing VillageGenerator.

[Xinyuuu7]

One of the more complicated structures that consist of multiple pieces.
Would be nice to have so it can be integrated into Minemap and so on.
An abstract generator for structures using StructurePools would probably simplify the process for new structures in the future even more. This could be based on the already existing VillageGenerator.

I have completed the BastionGenerator, and the generation is universal for any version (versions above 1.17.1 have not been tested, but it seems that Mojang has not changed the generation, so I believe it is universal for all versions) Also, the loot part of 1.16.1+ is still incorrect, and the reason should be in the loottables. I think I will fix it soon