* [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
* don't serve unused fields for video attachments
* parse video bitrate + duration more accurately
* use ServeContent where appropriate to respect Range
* abstract temp file seeker into its own function
* don't omitempty on description
* don't omitempty on any fields
* add ms to timestamp format
* don't omitempty on text_url
* rearrange attachment fields a bit
* just give URL again as attachment text url
* update tests
* fix accidental replace
* start experimenting with swagger documentation
* further adventures in swagger
* do a few more api paths
* account paths documented
* go fmt
* fix up some models
* bit o lintin'
Inbox POST from federated servers now working for statuses and follow requests.
Follow request client API added.
Start work on federating outgoing messages.
Other fixes and changes/tidying up.
