2841 update copyright

[hiker]

There are two small updates to the script:

1. Ignore case
2. Also handle .cfg files.

I did fix up a few files manually (files with no date range given, and no "," after the year) - I couldn't see an easy fix to automate this, and once the file were modified, they won't be a problem again :)

I've asked Sergi, and he's ok with this update.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.88%. Comparing base (c6e9507) to head (e33bc4b).
Report is 6 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2842      +/-   ##
==========================================
- Coverage   99.88%   99.88%   -0.01%     
==========================================
  Files         359      358       -1     
  Lines       50264    49907     -357     
==========================================
- Hits        50208    49851     -357     
  Misses         56       56              

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[arporter]

Changes are all good, thanks.
I'll run the integration tests, just to be on the safe side.

[arporter]

Integration tests were green.