ImportC can now automatically run the preprocessor

[zjh]

On Monday, 16 May 2022 at 10:42:35 UTC, zjh wrote:
> On Monday, 16 May 2022 at 10:41:01 UTC, zjh wrote:

> `importC++` is the most important!

`importC++` may be impossible.
But `ImportRust` is definitely worth it!