[NuGet] Improve console output after project target framework changed.

In the Package Console show more information:

1. Show packages that are compatible with the new project target
framework but require a reinstall.
2. Show packages that are incompatible with the new project target
framework.
[NuGet] Show status bar error for incompatible packages.

Previously if a package was found to be incompatible with the new
project target framework it was reported as a warning in the status
bar. Now it is reported as an error.