Added new handling for finding and filtering parent scopes.
* Added new "GetParentScopes<T>() and GetParentScopesAndSelf<T>() functions to scope
* Replaced the "NamedScope.FullName" property with a "GetFullName()" method that relies on GetParentScopesAndSelf<T>()
* Replaced "IsNamespaceAlias" with "IsNamespaceImport" (clarity)
* Updated tests
Merge branch 'topic-data-incrementalupdate' of github.com:abb-iss/SrcML.NET into topic-data-incrementalupdate