D lexer, parser, and ImportC parser are now standalone

[Richard (Rikki) Andrew Cattermole]

On 14/04/2023 1:24 AM, Andrej Mitrovic wrote:
> Maybe I could try with DMD `master`. Although `digger` no longer seems 
> to work so I bet it's gonna be a pain building everything from scratch.

You don't need to build dmd, so digger won't be helpful anyway.

The frontend is pretty isolated as far as overall requirements go.