Fix error in /up when used out of bounds.

Also reduce calls to Entity#getLocation() all over since it's
more expensive than it needs to be (adapts world/vector every time).

worldedit-core/src/main/java/com/sk89q/worldedit/extension/platform/PlayerProxy.java

@@ -178,4 +178,9 @@ class PlayerProxy extends AbstractPlayerActor {
     public <B extends BlockStateHolder<B>> void sendFakeBlock(BlockVector3 pos, B block) {
         basePlayer.sendFakeBlock(pos, block);
     }
+
+    @Override
+    public void floatAt(int x, int y, int z, boolean alwaysGlass) {
+        basePlayer.floatAt(x, y, z, alwaysGlass);
+    }
 }