* 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
This adds a LogLevel setting for both Websocket and VoiceConnections
that can be configured to set the specific log level desired. This
also adds a new logging function that adds additional helpful
information when printing out log messages.
