Move And + Or selection strategies to util

pgpainless-core/src/main/java/org/pgpainless/encryption_signing/EncryptionBuilder.java

@@ -36,7 +36,7 @@
 import org.pgpainless.key.protection.SecretKeyRingProtector;
 import org.pgpainless.key.selection.key.PublicKeySelectionStrategy;
 import org.pgpainless.key.selection.key.SecretKeySelectionStrategy;
-import org.pgpainless.key.selection.key.impl.And;
+import org.pgpainless.key.selection.key.util.And;
 import org.pgpainless.key.selection.key.impl.EncryptionKeySelectionStrategy;
 import org.pgpainless.key.selection.key.impl.NoRevocation;
 import org.pgpainless.key.selection.key.impl.SignatureKeySelectionStrategy;

pgpainless-core/src/main/java/org/pgpainless/key/selection/key/impl/And.java → pgpainless-core/src/main/java/org/pgpainless/key/selection/key/util/And.java

@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.pgpainless.key.selection.key.impl;
+package org.pgpainless.key.selection.key.util;
 
 import javax.annotation.Nonnull;
 

pgpainless-core/src/main/java/org/pgpainless/key/selection/key/impl/Or.java → pgpainless-core/src/main/java/org/pgpainless/key/selection/key/util/Or.java

@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.pgpainless.key.selection.key.impl;
+package org.pgpainless.key.selection.key.util;
 
 import javax.annotation.Nonnull;
 

pgpainless-core/src/main/java/org/pgpainless/key/selection/key/util/package-info.java

@@ -0,0 +1,19 @@
+/*
+ * Copyright 2018 Paul Schaub.
+ *
+ * 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.
+ */
+/**
+ * Implementations of utility Key Selection Strategies.
+ */
+package org.pgpainless.key.selection.key.util;

pgpainless-core/src/main/java/org/pgpainless/util/BCUtil.java

@@ -42,7 +42,7 @@
 import org.bouncycastle.util.io.Streams;
 import org.pgpainless.algorithm.KeyFlag;
 import org.pgpainless.key.selection.key.PublicKeySelectionStrategy;
-import org.pgpainless.key.selection.key.impl.And;
+import org.pgpainless.key.selection.key.util.And;
 import org.pgpainless.key.selection.key.impl.NoRevocation;
 import org.pgpainless.key.selection.key.impl.SignedByMasterKey;