Also move duplicated code into repo.APIFormat(..)

From code.gitea.io/go-sdk/gitea
  To code.gitea.io/sdk/gitea

- Update import paths from github.com/go-gitea to code.gitea.io
- Fix import path for travis

See https://docs.travis-ci.com/user/languages/go#Go-Import-Path

* Write LDAP, SMTP, PAM, DLDAP back to all uppercase

* Fix type in unused constant name

* Other MixCased fixes

* Complete MixerCasing of template constants

* Re uppercase LTS and LDAPS suffixes

* Uppercase JSON suffix in constant names

* Proper case LoginNoType

* Prefix unexported template path constants with "tpl"

See https://github.com/golang/go/wiki/CodeReviewComments#mixed-caps

* Replace gogits/git-module dependency with go-gitea/git

Fixes #92

* Remove git alias for git module import (not needed)

- Fill Milestone and Assignee field when available in webhook payload

RepoLink -> Link, RepoRelLink -> RelLink, FullRepoLink -> FullLink

This prevents user retrieve arbitrary webhook by changing URL to
access webhook from other unauthorized repositories.

Was using the wrong method and now uses the method which checks if
the avatar link is relative or not.