Support toolsets for Visual Studio

Hi, I would expect ConanMultiPackager to have Visual Studio toolset option. Something like this:

builder = ConanMultiPackager(username="username",
  channel="stable",
  visual_versions=["15"],
  visual_toolsets=["v140", "v140_clang_c2"])

Could you suggest a workaround or implement this option?

[lasote]

We could introduce it and generate the corresponding builds because conan supports the visual toolsets from 0.29, but it only makes sense to specify toolsets for a specific visual version. So probably the parameter should be a dictionary:

visual_toolsets={"15": ["v140", "v140_clang_c2"]}

And for the corresponding environment variable, we could think in a text representation.

[luckielordie]

I’m eager for this functionality 😃