* use AfterLoad instead of AfterSet on Structs

* fix the comments on AfterLoad

* fix the comments on action AfterLoad

* use created & updated instead BeforeInsert & BeforeUpdate

* fix vendor checksum

* only show generated SQL when development mode

* remove extra update column updated_unix

* remove trace config

* feat: add download count field and unit testing.

* fix: unit testing

* refactor: improve testing.

* fix: update comment

* add default value.

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>

* Allow custom public files

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

Moved attachments into seperate go file