VisualD with latest VS2019 (and 2022)

[awson]

I tried to build `msbuild\dbuild` project against latest VS2019 
16.11.6.

First I fixed a few wrong references to get things compiled, and 
finally found `MultiToolTaskVisualD.cs` compilation failing 
because of `taskScheduler` doesn't exist and because of several 
type mismatches.

Indeed, in the latest VS2019 `taskScheduler` went private and 
`MultiToolTask` class quite differs from that in earlier VS2019s.

(VS2022's `MultiToolTask` differs further)

Another my impression from looking into `visuald` repo is that it 
isn't actively developed at all.

So I'm wondering:

1. How big is `visuald`'s userbase?
2. Is `visuald` considered a viable IDE for D language?

I could help with fixing the problems with latest VS2019 and 
VS2022, but I need some help with what the `Package` compilation 
model is.

Can anybody point me to where is it explained in the context of 
`visuald`?

Does there exist any example of a `visuald` project using the 
`Package` compilation model?