ImportC can now automatically run the preprocessor

[bauss]

On Monday, 16 May 2022 at 10:42:35 UTC, zjh wrote:
> On Monday, 16 May 2022 at 10:41:01 UTC, zjh wrote:
>
>>> importRust and importGo are coming in the next release.
>>>
>
> `importC++` is the most important!

importC++ won't happen because that's just going to be D as D is 
often seen as a better C++ for whatever reason.

There's no need to have importC++ for philosophical D reasons.