Added copyright NOTICE and project license, cleaned up notices in files

I want the legal state of the project to be clear while avoiding unnecessary
amount of boilerplate in source code (with duplicated content) which some open
source projects tend to create. The notice in source is now way smaller while
the notice in NOTICE gives much better overview of the entire project.

I hope this is a solution that respects the project's history, original author,
and all contributions made to it over the years.

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