[WIP] [Feature] Implement issue reference cross comment

[jaqra]

I am trying to add issue reference comment.

Can you tell me your opinions?

Currently gitea adds comment when:

• New Issue (From Title)
• New Issue (From Content)
• Update Issue Title
• Update Issue Content
• New Comment
• Update Comment

But:

• I think i should add a column for check if comment has already exists

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@10dfb44). Click here to learn what that means.
The diff coverage is 10.12%.

@@            Coverage Diff            @@
##             master    #8147   +/-   ##
=========================================
  Coverage          ?   41.75%           
=========================================
  Files             ?      482           
  Lines             ?    64636           
  Branches          ?        0           
=========================================
  Hits              ?    26990           
  Misses            ?    34172           
  Partials          ?     3474

Impacted Files	Coverage Δ
routers/repo/issue.go	35.29% <0%> (ø)
models/issue_comment.go	47.87% <10.16%> (ø)
models/issue.go	49.57% <25%> (ø)

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[jaqra]

Ohh sorry @guillep2k :(

I did not see that #8137 PR. I'm closing this.