* [chore] Remove years from all license headers
Years or year ranges aren't required in license headers. Many projects
have removed them in recent years and it avoids a bit of yearly toil.
In many cases our copyright claim was also a bit dodgy since we added
the 2021-2023 header to files created after 2021 but you can't claim
copyright into the past that way.
* [chore] Add license header check
This ensures a license header is always added to any new file. This
avoids maintainers/reviewers needing to remember to check for and ask
for it in case a contribution doesn't include it.
* [chore] Add missing license headers
* [chore] Further updates to license header
* Use the more common // indentend comment format
* Remove the hack we had for the linter now that we use the // format
* Add SPDX license identifier
* define timeline consts
* remove double stream of status
* change test stream creation up a bit
* stream messages more selectively
* add test for streaming new status creation via clientAPI
* tidy code + comments a bit
* tidy up tests
* make sure new status isn't streamed to public
* tidy up streaming
* cut down code duplication
* test get followers/following
* test streaming processor
* fix some test models
* add TimeMustParse
* fix uri / url typo
* make trace logging less verbose
* make logging more consistent
* disable quote on logging
* remove context.Background
* remove many extraneous mastodon references
* regenerate swagger
* don't log query on no rows result
* log latency first for easier reading
