Add Bulk package installation targets

[kMutagene]

Currently, all packages get installed in a bulk operation. This is not always necessary and there is a need for specific workflows to be accessible on an optional basis.

A way to solve this could be build targets that install a set of packages when executed. These packes must be added to:

• paket.references
• paket.dependencies
• CSBScaffold.fsx this is the crucial part. Dependencies must be referenced in the correct order in this file. One way to ensure this could be the dependency tree built by paket itself, but im not sure how to correcty access that.

Ideas for bulk packages:

• Machine learning: CNTK, ML.NET and dependencies. These are rather large packages and not needed for unrelated workflows

• Type providers: R, Python, maybe more i cant think of currently

[kMutagene]

One way to ensure this could be the dependency tree built by paket itself, but im not sure how to correcty access that.

The way to go is using paket-generated loadscripts.

[kMutagene]

While most of the time the load scripts should work, keep in mind that issues such as dotnet/SqlClient#292 exist.