Rename COPYING to LICENSE

[scpeters]

🦟 Bug fix

Fixes automatic detection of license type. Similar to https://github.com/gazebosim/gz-math/pull/521.

Summary

The LICENSE file contained a copy of the stanze used at the top of source code files, while the actual license was in the COPYING file. So remove the stanza and put the actual Apache 2.0 license text in LICENSE.

Checklist

• [X] Signed all commits for DCO
• [ ] Added tests
• [ ] Updated documentation (as needed)
• [ ] Updated migration guide (as needed)
• [ ] Consider updating Python bindings (if the library has them)
• [X] codecheck passed (See contributing)
• [X] All tests passed (See test coverage)
• [ ] While waiting for a review on your PR, please help review another open pull request to support the maintainers

Note to maintainers: Remember to use Squash-Merge and edit the commit message to match the pull request summary while retaining Signed-off-by messages.

[codecov[bot]]

Codecov Report

Merging #525 (31cfd00) into ign-gui3 (0152bef) will not change coverage. The diff coverage is n/a.

:exclamation: Current head 31cfd00 differs from pull request most recent head 4a614bb. Consider uploading reports for the commit 4a614bb to get more accurate results

@@            Coverage Diff            @@
##           ign-gui3     #525   +/-   ##
=========================================
  Coverage     73.82%   73.82%           
=========================================
  Files            30       30           
  Lines          3270     3270           
=========================================
  Hits           2414     2414           
  Misses          856      856           

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