Implemented 'Bug 15248 - CRNL vs NL policy setting warning is too
obtrusive'.
Bump nrefactory.
[core] Use a csproj reference, not dll reference, for raygun

Now it will build as expected
[SourceEditor] Fixed old cairo API.
Bump xwt and md-addins
Bump xwt and md-addins
[Core] Log{Internal,Critical,Fatal}Error now Log(LogLevel.Error) in addition to ReportUnhandledException.
Change the submodule path
Use raygun4net submodule from mono instead of bratsche
[Core] Get the Raygun API key through branding service rather than environment.
[Core] LogInternalError() now sets silent = true
[Core] LogCriticalError() now sets willShutdown = false