`ReaderFactory.Open()` calls `ZipArchive.IsZipFile()` to determine if
the `Stream` is a zip archive, which calls into
`ZipHeaderFactory.ReadHeader()`, which throws a `NotSupportedException`
when the `Stream` is not a zip archive.
To be clear, this exception is caught and `IsZipFile()` returns `false`,
but when called in a hot-path, these exceptions can become expensive.
To address this issue, `ReadHeader` now returns `null` in the default
cause instead of throwing. All callsites were already checking for and
handling `null`, so no behavior changes.
* Fixing build
* Fixing build
* Fixing build
* Fixed build (seems working now)
* Added support to force specific encoding when reading or writing an archive
* Minor fixed related to force encoding
* Removed obsolete project file not present in master
