Plug-ins incorrectly flagged as incompatble when loading multiple versions of an assembly

[jeroens]

Plug-ins may load different versions of assemblies. The office interop .NET assemblies for instance load older versions of mscorlib which is legitimate. As long as the plug-in assembly also loads a newer version of a .NET assembly the project will work well.

Currently, the plug-in loading process validates compatibility against the worst compatibility factor. This needs to be adjusted to base the final compatibility score on the best compatibility score for each assembly name.