Task/rhornung67/simplify copyright

[rhornung67]

Summary

• This PR simplifies and reduces repo disruption of copyright year updates
• Previously we would run a script to update the copyright info in every file at the start of each new year. This is unnecessary and excessive.
• With this PR, the copyright year appears in only two files and the copyright header in every file in the repo simply refers to the top-level LICENSE file.
• Now running the script to update the copyright year will only modify two files, which is much less disruptive to the repo change history.
• This basically follows what Conduit does.

NOTE that there are a lot of files changed. But the changes are similar throughout.