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Code cleanup
There are new code quality checks and rules added in the recent versions of StyleCop, Sonar, and xUnit C# analyzers. Those rules trigger warnings in the current codebase.
Description
This is a code cleanup change to fix those code quality violations.
Testing steps
Automated tests should pass.
Known issues
There are three more xUnit1042 warnings for three tests because those tests use
[MemberData]
attribute with non-serializable test data. Making the test data serializable will require significant changes in theVersOne.Epub.Schema
classes (all schema classes need to have an empty constructor and all their properties need to be writable), so it's better to leave such change for a separate PR.