Fix internal EPPlus4 races and document threading limits - #27

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Type 'Tests' owns disposable field(s) 'ExcelApp' but is not disposable (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1001)

Re-throwing caught exception changes stack information (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca2200)

'Uri.EscapeUriString(string)' is obsolete: 'Uri.EscapeUriString can corrupt the Uri string in some cases. Consider using Uri.EscapeDataString for query string components.' (https://aka.ms/dotnet-warnings/SYSLIB0013)

'XmlTextReader.ProhibitDtd' is obsolete: 'Use DtdProcessing property instead.'

'XmlReaderSettings.ProhibitDtd' is obsolete: 'Use XmlReaderSettings.DtdProcessing property instead.'

Unsafe overload of 'Load' method (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca3075)

Change ExcelRange.ExcelRangeEnum.Dispose() to call GC.SuppressFinalize(Object). This will prevent derived types that introduce a finalizer from needing to re-implement 'IDisposable' to call it. (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1816)

Exception type System.IndexOutOfRangeException is reserved by the runtime (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca2201)

ExcelCell should define operator(s) '<=, >=' since it implements IComparable (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1036)

ExcelRange should define operator(s) '<=, >=' since it implements IComparable (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1036)