Happy new year (#7814)

* Happy new year

Updates the copyright years and fixes wrong license headers.

* Fix the template

* Split HEADER into HEADER-APACHE & HEADER-GPL

substrate/primitives/consensus/common/src/lib.rs

@@ -1,18 +1,19 @@
-// Copyright 2018-2020 Parity Technologies (UK) Ltd.
-// This file is part of Substrate Consensus Common.
+// This file is part of Substrate.
 
-// Substrate Demo is free software: you can redistribute it and/or modify
-// it under the terms of the GNU General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
+// Copyright (C) 2018-2021 Parity Technologies (UK) Ltd.
+// SPDX-License-Identifier: Apache-2.0
 
-// Substrate Consensus Common is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-// GNU General Public License for more details.
-
-// You should have received a copy of the GNU General Public License
-// along with Substrate Consensus Common.  If not, see <http://www.gnu.org/licenses/>.
+// 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.
 
 //! Common utilities for building and using consensus engines in substrate.
 //!