One Spatial Dimension (#4570)

* Ported the "one spatial dimension" concept from pre-1.15

* Apply lighting updates after moving chunks.
Mark world data as dirty when changing it.

* Consolidated naming of spatial storage world/dimension.
Use server light manager to update lighting info in chunk.

* Save last transition information,
and add ae2 spatial command to interact with spatial storage.

* Formatting fixes.

* Improved docs for the origin generation.

Inverted condition on when the x/z axis are flipped.
Also added a helper to map a plot to a region file

* Remove TransitionResult since it's only used in lieu of a boolean.
Rework transition to make the checks BEFORE allocating a new cell.

* Removed unused imports.

Co-authored-by: yueh <yueh@users.noreply.github.com>

src/main/java/appeng/worldgen/meteorite/MeteoriteStructurePiece.java

@@ -38,6 +38,12 @@ public class MeteoriteStructurePiece extends StructurePiece {
     public static final IStructurePieceType TYPE = IStructurePieceType.register(MeteoriteStructurePiece::new,
             "AE2MTRT");
 
+    public static void register() {
+        // THIS MUST BE CALLED otherwise the static initializer above will not run,
+        // unless world generation is actually invoked, which means that chunks may
+        // be loaded without this being registered as a structure piece!
+    }
+
     private PlacedMeteoriteSettings settings;
 
     protected MeteoriteStructurePiece(BlockPos center, float coreRadius, CraterType craterType, FalloutMode fallout,