[Low priority] Avoid replicating copywrite banner with outdated year

[russelldj]

Low priority, but it would be nice to stop duplicating a massive header banner everywhere, or updating the year every time you touch a file. Could we have a simplified version that points to a main license file, like KWIVER does?

[mattdawkins]

I have no objections, just the time cost of setting it up and deciding what the copyright banner should say