Unused import tool

[Richard (Rikki) Andrew Cattermole]

On 19/08/2023 5:00 AM, 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.

This is sounding an awful lot like the import should be done where it is 
used and a dedicated log functions should be implemented.

I quite often do something like:

```d
version(none) {
	debug {
		try {
			import std.stdio;
			writeln("...");
			stdout.flush;
		} catch (Exception) {
		}
	}
}
```

I.e.

https://github.com/Project-Sidero/basic_memory/blob/main/source/sidero/base/text/internal/builder/operations.d#L1199

Also add random debug blocks to do extra verification:

https://github.com/Project-Sidero/basic_memory/blob/main/source/sidero/base/text/internal/builder/operations.d#L783

Both ``version(none)`` and ``debug`` blocks are absolutely amazing tools 
for dealing with debug only code that shouldn't see production!

Very helpful for when I come back to complex code after many months or 
years and hitting segfaults if you catch my drift ;)