Unused import tool

[RazvanN]

On Friday, 18 August 2023 at 17:00:33 UTC, Walter Bright wrote:
> I ask that `import core.stdc.stdio;` stop being regularly 
> deleted, as I regularly add it back in. dmd uses printf all 
> over the place for debug information.

I haven't deleted any core.stdc.stdio imports in the PRs that 
have been enabled by the tool (even though the tool correctly 
reported those as being unused).