Feature Request: Move GenesisDoubleDropsWall from Genesis over to Nitrogen

[Zepalesque]

My request is to move the GenesisDoubleDropsWall class from Genesis over to Nitrogen

The reason this would be helpful is for addon creators who want to use log walls, so they don't need to copy that class if they want them to have double drops.

Plus, Nitrogen already has datagen for log walls so it'd make a lot of sense to have the actual class as well.

[Zepalesque]

oh, another thing that'd be helpful is for the fixShapeMaps and fixShapeMap methods in the class to be protected rather than private and for fixShapeMap to be non-static (plus return the ImmutableMap.Builder<BlockState, VoxelShape>), I have a specific use case where extending them would be useful
edit: okay actually nevermind, after testing the implementation I had in mind for extension, that did not work 😂