Remove csproj dumper.exe

parent #902 

@lodejard , please help to check whether the new approach matches your idea precisely.
@lodejard , here is the ugly part of this approach: since we are calling MSBuild on ReferencesResolver.xml, instead of the original csproj file, MSBuild thinks ReferenceResolver.xml is the project file. All assembly/reference paths are generated using a ReferenceResolver.xml as base dir. MSBuild cannot find references using relative paths and it gives warnings.