Backport #28454 (the only conflict is caused by some comments)
* Close #24483
* Close #28123
* Close #23682
* Close #23149
(cherry picked from commit a3f403f438)
Conflicts:
modules/setting/ui.go
trivial context conflict
Change all license headers to comply with REUSE specification.
Fix #16132
Co-authored-by: flynnnnnnnnnn <flynnnnnnnnnn@github>
Co-authored-by: John Olheiser <john.olheiser@gmail.com>
Follows: #19284
* The `CopyDir` is only used inside test code
* Rewrite `ToSnakeCase` with more test cases
* The `RedisCacher` only put strings into cache, here we use internal `toStr` to replace the legacy `ToStr`
* The `UniqueQueue` can use string as ID directly, no need to call `ToStr`