Crash Report output - Add external app filepath conversion to ReportCrashUsingCrashReportClient()

Sandbox mode not dealt with here...

const FString CrashContextXMLPath = FPaths::Combine( *FPaths::GameLogDir(), *CrashContext.GetUniqueCrashName(), FPlatformCrashContext::CrashContextRuntimeXMLNameW );
CrashContext.SerializeAsXML( *CrashContextXMLPath );
WerReportAddFile( ReportHandle, *CrashContextXMLPath, WerFileTypeOther, WER_FILE_ANONYMOUS_DATA );

Needs ConvertToAbsolutePathForExternalAppForRead/ConvertToAbsolutePathForExternalAppForWrite calls adding where necessary.

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