* refactor setting router code

splitted up one huge router settings file into the smaller files
representing the actual page structure

* move code to subfolder

* rename functions

* renamed files

* add copyright information

* moved avatar to profile page

* combined password change, email and account deletion into account settings page

* combined totp, access tokens, linked accounts and openid into security settings page

* move access tokens to applications settings page

* small change to restart drone build

* fix change avatar url on profile page

* redirect old settings urls to new ones

* enforce only one autofocus attribute on settings pages

* set correct redirect status code

* fmt fix

* Replace all ctx.Handle with ctx.ServerError or ctx.NotFound

* Change Handle(403) to NotFound, avoid using macaron's NotFound