* add [ui] Reactions
* move contend check from form to go functions
* use else if
* check if reaction is allowed only on react
(so previous custom reaction can be still removed)
* use $.AllowedReactions in templates
* use ctx.Flash.Error
* use it there too
* add redirection
* back to server error
because a wrong reaction is a template issue ...
* add emoji list link
* add docs entry
* small wording nit
suggestions from @jolheiser - thx
* same reactions as github
* fix PR reactions
* handle error so template JS could check
* Add Integrations Test
* add REACTIONS setting to cheat-sheet doc page
* Update ref comment
* Generate comment on simple ref
* Make fmt + remove unneeded repo load
* Add TODO comments
* Add ref-check in issue creation; re-arrange template
* Make unit tests pass; rearrange code
* Make fmt
* Filter out xref comment if user can't see the referencing issue
* Add TODOs
* Add cross reference
* Rearrange code; add cross-repository references
* Striketrhough obsolete references
* Remove unnecesary TODO
* Add "not supported" note
* Support for edits and deletes, and issue title
* Revert changes to go.mod
* Fix fmt
* Add support for xref from API
* Add first integration test
* Add integration tests
* Correct formatting
* Fix add comment test
* Add migration
* Remove outdated comments; fix typo
* Some code refactoring and rearranging
* Rename findCrossReferences to createCrossReferences
* Delete xrefs when repository is deleted
* Corrections as suggested by @lafriks
* Prepare for merge
* Fix log for errors
