allow rollforwards, and unify proj-info versions since they'd drifted #818
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This enables FSAC to rollforward to different major versions of the framework. This builds on Enrico's earlier work. It's required because the msbuild locator utility we use has an implicit cap of the reported System.Environment.Version, so FSAC itself needs to be run on .net 6.
Coupled with this change, we need a change to ionide to allow setting additional .net cli args, because users will have to set
--fx-version <desired 6.0 runtime version>
in order for things to work on .net 6.I think this will continue to be the case even after the 6.x stables, and at some point we may need to put out a 6.x build, but this at least patches over the cracks.