Fix File License Headers

[romeara]

Eclipse auto-generated EPL license headers instead of Apache 2.0 headers - update these in the source files to:

/*
 * Copyright 2019 StarChart-Labs Contributors (https://github.com/StarChart-Labs)
 *
 * 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.
 */