fixed: SourceCodeClassifier does not detect as used module with ModuleSuffix attribute open statement
fix a test
remove commented code

simplify an expression in AssemblyContentProvider
fixed: SourceCodeClassifier does not work properly with unqualified DU cases
Merge pull request #600 from vasily-kirichenko/fix-source-code-classifier-module-suffixes

fixed: SourceCodeClassifier does not detect as used module with ModuleSuffix attribute open statement