Multi targeting support

[hugener]

Hi everyone

I find this tool super useful, but now have a use case where I need it to work with multitargeting.

This would mean the package have to provide a targets file in the "buildCrossTargeting" folder next to the "build" folder.

Some packages I make myself just deploy the same targets file from build into the other folder as well, but I'm not sure it's sufficient in this case. Doing this would mean that the tool would run once for TargetFramework in the consuming project, meaning IL would be repacked for each of them.

Do you think this could be supported?