monodoc.dll.config does not substitute monodoc_refdir

[Therzok]

https://github.com/mono/api-doc-tools/blob/c503071997d1cfcdb5a039a8a36e530412cb0acb/monodoc/monodoc.dll.config#L3

This is not substituted in the shipped nuget package

[Therzok]

One possible solution would be for monodoc to find out where the current runtime (i.e. Type.GetType ("Mono.Runtime") then get the right path and figure out windows-isms, and set it via System.Configuration.

[sandyarmstrong]

An option on typical Mac systems is to use RootTree.LoadTree("/Library/Frameworks/Mono.framework/Versions/Current/lib/monodoc/");