Add reference functionality to issues like PR have it

[luwol03]

• Gitea version (or commit ref): 50a9727
• Git version: 2.20.1
• Operating system: Debian 10
• Database (use [x]):
  • PostgreSQL
  • MySQL
  • MSSQL
  • SQLite
• Can you reproduce the bug at https://try.gitea.io:
  • Yes (provide example URL) https://try.gitea.io/luwol03/test/issues/3
  • No
  • Not relevant

Description

now we can only do this afaik:

And my idea would be to add the functionality to refere a line of code in an issue like the review function at PR

so we have a extra button by viewing the code like this:

I don't know if you understand what I mean. if not please contact me.

[stale]

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