ErrLib v1.1 update

The new version of ErrLib was released. Changes in the new version: 

• Add support for custom logging target (ErrLib_SetLoggingCallback)
• Add C++ exception API (ErrLib_CPP.h)
• Add high-level stack trace API (ErrLib_Except_GetStackTraceData)
• Add NuGet package
• Add API docs using Doxygen
• Fix crash in ErrLib_PrintStack on x64
• Fix ErrLib_PrintStack crash on Win7 when reading PDB symbols built with /DEBUG:FASTLINK option

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