core: delete deprecated ToFilter

This filter was marked deprecated in 2017 with 5d0dd49e6 ("Introduce
ToMatchesFilter"), time to delete it.

smack-core/src/main/java/org/jivesoftware/smack/filter/ToFilter.java

@@ -1,50 +0,0 @@
-/**
- *
- * Copyright © 2014 Florian Schmaus
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package org.jivesoftware.smack.filter;
-
-import org.jivesoftware.smack.packet.Stanza;
-
-import org.jxmpp.jid.Jid;
-
-/**
- * Match based on the 'to' attribute of a Stanza.
- *
- * @deprecated use {@link ToMatchesFilter} instead.
- */
-@Deprecated
-public class ToFilter implements StanzaFilter {
-
-    private final Jid to;
-
-    public ToFilter(Jid to) {
-        this.to = to;
-    }
-
-    @Override
-    public boolean accept(Stanza packet) {
-        Jid packetTo = packet.getTo();
-        if (packetTo == null) {
-            return false;
-        }
-        return packetTo.equals(to);
-    }
-
-    @Override
-    public String toString() {
-        return getClass().getSimpleName() + ": to=" + to;
-    }
-}