dud: A dub replacement

[Sebastiaan Koppe]

On Monday, 25 November 2019 at 12:15:42 UTC, Joseph Rushton 
Wakeling wrote:
> What's currently broken or impossible in DUB?  What parts of 
> that can be fixed without changing the config or CLI?  And what 
> improvements are most efficiently made via breaking changes?
>
> Please, let's bring our focus on that.

The biggest thing for me would be incremental compilation. As 
well as a dub build and test 'watch' mode to avoid scanning the 
dependencies every time.