Try to solve the project level IU issue that srcML files of some projects are incorrectly deleted when closing the solution.
Addressed https://github.com/abb-iss/SrcML.NET/issues/31
Fixed spelling errors
Merge branch 'topic-incrementalupdate' into data-demo

Conflicts:
	VisualStudio/ABB.SrcML.VisualStudio.SolutionMonitor/SolutionMonitor.cs