moddable SDK for use in Agoric builds (WIP)

Moddable SDK with linux tools built:

~/projects/moddable/build/makefiles/lin$ make
~/projects/moddable/build/makefiles/lin$ cd ../../../..
~/projects$ tar czf ./moddable-15c57243-lin.tgz moddable/
~/projects$ tar tf moddable-15c57243-lin.tgz |head -5
moddable/
moddable/documentation/
moddable/documentation/commodetto/
moddable/documentation/commodetto/poco.md
moddable/documentation/commodetto/commodetto.md