Improve template helper (#24417)
It seems that we really need the "context function" soon. So we should
clean up the helper functions first.
Major changes:
* Improve StringUtils and add JsonUtils
* Remove one-time-use helper functions like CompareLink
* Move other code (no change) to util_avatar/util_render/util_misc (no
need to propose changes for them)
I have tested the changed templates:




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Co-authored-by: Giteabot <teabot@gitea.io>
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