* fix upload attachments

* add migration for new column uploader_id on table attachment

* fix imports sequence

Include both a log entry and the blocked mime type in the gitea log when
an attachment upload is blocked.

Chosen log level is info; this may need to be dialed down to trace.

* Allow custom public files

* Gofmt code, lots of places not related to this pr

Moved attachments into seperate go file