Update Copyright/License header in implementation files.

Update Copyright/License header in implementation files according to plan.

Discover/develop script to run this across the repositories.

After very fast researching of tools
https://github.com/cloudposse/copyright-header
https://github.com/google/addlicense
looks like for our purposes will be more efficient to run this work as manual tasks.

[pleszkiewicz]

@SPaluchiewiczSofomo FYI While working on unit tests for iOS, I updated all source files' headers to the following content:

//
// Copyright (c) 2019 Magic Leap, Inc. All Rights Reserved
//

Thanks to @pleszkiewicz work it's done on iOS side. @panwrona, @darek607 how does it look on Android side?

[darek607]

waiting for the license part of the header

[darek607]

As I remember we should follow the Apache licence. So I have prepared a complete header we should use.

Copyright (c) 2019 Magic Leap, Inc. All Rights Reserved

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.

This is a standard licence header taken from: https://www.apache.org/licenses/LICENSE-2.0

[pleszkiewicz]

@kpiascik ☝️

[kpiascik]

LGTM

[darek607]

For everyone working in Android Studio (@panwrona, @mateuszmwojcik), please configure a copyright header template in settings - this way the header will be added automatically for every new file.
File->Settings->Editor->Copyright->Copyright Profiles.