Don't cache location for circle brush, fix #970

Also, allow filled circles (very cool feature)

worldedit-core/src/main/java/com/boydti/fawe/object/brush/CircleBrush.java

@@ -10,16 +10,22 @@ import com.sk89q.worldedit.math.Vector3;
 import com.sk89q.worldedit.math.transform.AffineTransform;
 
 public class CircleBrush implements Brush {
-    private final Player player;
 
-    public CircleBrush(Player player) {
+    private final boolean filled;
-        this.player = player;
+
+    public CircleBrush(boolean filled) {
+
+        this.filled = filled;
     }
 
     @Override
     public void build(EditSession editSession, BlockVector3 position, Pattern pattern, double size) throws MaxChangedBlocksException {
+        Player player = editSession.getPlayer();
+        if (player == null) {
+            return;
+        }
         Vector3 normal = position.toVector3().subtract(player.getLocation());
-        editSession.makeCircle(position, pattern, size, size, size, false, normal);
+        editSession.makeCircle(position, pattern, size, size, size, filled, normal);
     }
 
     private Vector3 any90Rotate(Vector3 normal) {

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

@@ -1985,8 +1985,6 @@ public class EditSession extends PassthroughExtent implements AutoCloseable {
 
         double threshold = 0.5;
 
-        LocalBlockVectorSet set = new LocalBlockVectorSet();
-
         double nextXn = 0;
         double dx;
         double dy;

worldedit-core/src/main/java/com/sk89q/worldedit/command/BrushCommands.java

@@ -221,13 +221,16 @@ public class BrushCommands {
         desc = "Creates a circle, which revolves around your facing direction"
     )
     @CommandPermissions("worldedit.brush.sphere")
-    public void circleBrush(Player player, InjectedValueAccess context,
+    public void circleBrush(InjectedValueAccess context,
                             @Arg(desc = "Pattern")
                                 Pattern fill,
                             @Arg(desc = "The radius to sample for blending", def = "5")
-                                Expression radius) throws WorldEditException {
+                                Expression radius,
+                            @Arg(name = "filled", desc = "Whether the circle should be filled", def = "false")
+                                boolean filled
+                            ) throws WorldEditException {
         worldEdit.checkMaxBrushRadius(radius);
-        set(context, new CircleBrush(player)).setSize(radius).setFill(fill);
+        set(context, new CircleBrush(filled)).setSize(radius).setFill(fill);
     }
 
     @Command(