Fix relight and removelight (#475)

* Start work on lighting engine (does not build)

* Implement getLighting

* Setting, flushing light etc works. Getting light should be working..?

* Better queue/chunk handling

* Use correct location for lighting update

* Correct set location, remove debug

* cleanup a little

* Fix fixlight

* Apply to all versions for the numpties

* Remove lighting extent if not using

* Actually bitmask blocks when setting in chunks

* Initialise Maps and Dequeues with inital size

* format

* Documentation maybe

worldedit-core/src/main/java/com/sk89q/worldedit/extent/Extent.java

@@ -651,6 +651,18 @@ public interface Extent extends InputExtent, OutputExtent {
         return count;
     }
 
+    default boolean relight(int x, int y, int z) {
+        return false;
+    }
+
+    default boolean relightBlock(int x, int y, int z) {
+        return false;
+    }
+
+    default boolean relightSky(int x, int y, int z) {
+        return false;
+    }
+
     /**
      * Have an extent processed
      *  - Either block (Extent) processing or chunk processing