Brief update on Metta

I've been working on toolchain building script, now at least on Macs it's possible to build a standalone toolchain for building Metta and you can download it and try to build it yourself. All necessary details are descibed on SourceCheckout wiki page. There is followup work to remove dependency on binutils and gcc (gcc will probably go first, then once lld is mature enough I could get rid of ld/gold).

Another update is about type system. The operations on type system are implemented now, I can successfully register type information and query it - some examples of that are in the recently released iso image R925. Next up is fixing some of naming context operations so I can actually create and operate hierarchical naming contexts.