Various minor

thread local cleans on close
remove unnecessary loop on set
remove unnecessary get on set
clean CFI cache on generate

worldedit-core/src/main/java/com/sk89q/worldedit/world/block/BlockType.java

@@ -164,7 +164,7 @@ public class BlockType implements FawePattern, Keyed {
      *
      * @return The default state
      */
-    public BlockState getDefaultState() {
+    public final BlockState getDefaultState() {
         return this.settings.defaultState;
     }