* Interactions: the Buttons (#933)

* Interactions: buttons

* Doc fix

* Gofmt fix

* Fix typo

* Remaking interaction data into interface

* Godoc fix

* Gofmt fix

* Godoc fix

* InteractionData helper functions and some fixes in slash commands example

* Fix components example

* Yet another fix of components example

* Fix interaction unmarshaling

* Gofmt fix

* Godoc fix

* Gofmt fix

* Corrected naming and docs

* Rolled back API version

* Requested fixes

* Added support of components to webhook and regular messages

* Fix components unmarshaling

* Godoc fix

* Requested fixes

* Fixed unmarshaling issues

* Components example: cleanup

* Added components tracking to state

* Requested fixes

* Renaming fix

* Remove more named returns

* Minor English fixes

Co-authored-by: Carson Hoffman <c@rsonhoffman.com>

* Doc fix

* Gofmt fix

* Fix typo

* Remaking interaction data into interface

* Godoc fix

* Gofmt fix

* Godoc fix

* InteractionData helper functions and some fixes in slash commands example

* Fix components example

* Yet another fix of components example

* Fix interaction unmarshaling

* Godoc fix

* Gofmt fix

* Corrected naming and docs

* Rolled back API version

* Requested fixes

* Added support of components to webhook and regular messages

* Interactions: select menus

* Example fix

* Merge fix

* Some fixes

* Added missing documentation

* Fix components unmarshaling

* Godoc fix

* Requested fixes

* Fixed unmarshaling issues

* Components example: cleanup

* Gofmt fix

* Godoc fix

* URL field renaming fix

* Added flags to followups

* Updated components example

* Fixed typo in components example

* Merge fix

* Improve handling of invalid interaction situations

* support allowing webhook edits with files, and responding to interactions with files (#931)

* allow files in webhook message edits

* add Files to WebhookEdit struct

* move the construction of the multipart body for files into a shared function

* allow  interaction responses to have files

* go fmt

* fix err shadowing

* document MakeFilesBody

* rename MakeFilesBody -> EncodeWithFiles. fix InteractionRespond responding twice

* use resp in InteractionRespond files, add basic-command-with-files example command

* import strings and go fmt

* EncodeWithFiles -> MultiPartBodyWithJSON

* go fmt

* fix example for slash_commands

* move files to responsedata

* Merge fixes

* Fixed rebase consequences

Co-authored-by: Carson Hoffman <c@rsonhoffman.com>
Co-authored-by: plally <pierce@vulpes.dev>