Added: Initial "ASP.NET Core on Linux" support, only limited features are available:

• DocumentConverter works except for conversions that require PortableEngine.

• DocumentViewer is not available as PortableEngine does not support Linux yet (due to Windows native DLL dependency).
  The explanatory error "PortableEngine is currently supported only on Windows platform." will be thrown until it's supported.
  Note that component will render but you will get the error when loading a document.

Improved: Updated AssemblyResolver (4.1.0.0) for initial Linux support (no unnecessary extraction of Windows native DLLs).

Added: DocumentUltimateConfiguration.CheckPlatformSupport method which is used to check a feature is supported on current OS platform.
Throws PlatformNotSupportedException if not. Possible feature values are "DocumentViewer", "PortableEngine".