Signed-off-by: Elias Norberg <elias@aisle.se>

* extract actions on new pull request from models to pulls service

* improve code

* move code.gitea.io/gitea/modules/pull to code.gitea.io/gitea/services/pull

* fix fmt

* Rename pulls.go to pull.go

* refuse merge until ci successfully

* deny merge request when required status checkes not succeed on merge Post and API

* add database migration for added columns on protected_branch

* fix migration

* fix protected branch check bug

* fix protected branch settings

* remove duplicated code on check pull request's required commit statuses pass

* remove unused codes

* fix migration

* add newline for template file

* fix go mod

* rename function name and some other fixes

* fix template

* fix bug pull view

* remove go1.12 wrong dependencies

* add administrator bypass when protected branch status check enabled

* fix bug

* improve the codes