Additional work towards 1.16 compatibility

- Very basic implementation of the SideEffects system. Will definitely need fine tuning for it to be functional, but is not considered a priority in my opinion.
- Minor changes to the World interface and World implementations related to the SideEffects system. Shouldn't be the cause of any new bugs but be on the lookout.
- Included debug in BukkitImplLoader.java to assist contributors in understanding what needs to be implemented for the adapter to load properly.

Still very WIP but we're a few steps closer. So far, this is coming along better than I anticipated. Hopefully we can keep the momentum.

worldedit-core/src/main/java/com/sk89q/worldedit/EditSession.java

@@ -117,6 +117,7 @@ import com.sk89q.worldedit.regions.shape.RegionShape;
 import com.sk89q.worldedit.regions.shape.WorldEditExpressionEnvironment;
 import com.sk89q.worldedit.util.Countable;
 import com.sk89q.worldedit.util.Direction;
+import com.sk89q.worldedit.util.SideEffectSet;
 import com.sk89q.worldedit.util.TreeGenerator;
 import com.sk89q.worldedit.util.eventbus.EventBus;
 import com.sk89q.worldedit.util.formatting.text.TranslatableComponent;
@@ -572,6 +573,20 @@ public class EditSession extends PassthroughExtent implements AutoCloseable {
         disableHistory(enabled);
     }
 
+    /**
+     * Set which block updates should occur.
+     *
+     * @param sideEffectSet side effects to enable
+     */
+    public void setSideEffectApplier(SideEffectSet sideEffectSet) {
+        //Do nothing; TODO: SideEffects currently not fully implemented in FAWE.
+    }
+
+    public SideEffectSet getSideEffectApplier() {
+        //Do nothing; TODO: SideEffects currently not fully implemented in FAWE.
+        return SideEffectSet.defaults();
+    }
+
     /**
      * Disable history (or re-enable)
      *