Download only dependencies from specific asd

[VisenDev]

I've got some directories in my project that contain files which I don't want to be scanned by vend. Ideally, it would be nice if I could specific for vend to only download the dependencies coming from a specific asd file.

(Right now it causes an error if I run vend get with my tooling directory present. I have to temporarily move the tooling directory somewhere else before running vend get)

[fosskers]

Some other commands like graph already support the notion of a "focus", so it's reasonable to extend that idea to get as well.

[VisenDev]

I've also found that the current approach to downloading dependencies also downloads a ton of unnecessary packages for running tests. For example, this is the dependency graph from one of my projects.

Notice that only a small portion of the graph is a dependency of my actual project (clgfw), all of the other dependencies are coming from test systems.

[fosskers]

Downloading all the test dependencies too is by design (for now). Note that that doesn't happen for transitive dependencies that also happen to have test systems.