No longer read any JSON META data when loading modules
No longer read any JSON META data when loading modules

The only bit we needed from the META data was the id of the source file
for a module. Just add this to the short-name lookup file and take it
from there.
As the CompUnit contains a reference to the Distribution object, we now
give it a lazily initializing one that only reads the META data in the
rare case that someone actually accesses it.

awwaiid/rakudo,raydiak/rakudo,MasterDuke17/rakudo,sjn/rakudo,tbrowder/rakudo,salortiz/rakudo,Gnouc/rakudo,rakudo/rakudo,tony-o/rakudo,labster/rakudo,softmoth/rakudo,salortiz/rakudo,softmoth/rakudo,raydiak/rakudo,tbrowder/rakudo,Gnouc/rakudo,labster/rakudo,awwaiid/rakudo,rakudo/rakudo,samcv/rakudo,nbrown/rakudo,sjn/rakudo,usev6/rakudo,lucasbuchala/rakudo,raydiak/rakudo,raydiak/rakudo,usev6/rakudo,Gnouc/rakudo,labster/rakudo,labster/rakudo,softmoth/rakudo,tony-o/rakudo,awwaiid/rakudo,MasterDuke17/rakudo,tony-o/rakudo,MasterDuke17/rakudo,samcv/rakudo,samcv/rakudo,rakudo/rakudo,tbrowder/rakudo,MasterDuke17/rakudo,lucasbuchala/rakudo,tony-o/rakudo,softmoth/rakudo,lucasbuchala/rakudo,salortiz/rakudo,rakudo/rakudo,salortiz/rakudo,awwaiid/rakudo,labster/rakudo,Gnouc/rakudo,jonathanstowe/rakudo,MasterDuke17/rakudo,salortiz/rakudo,Gnouc/rakudo,softmoth/rakudo,tony-o/rakudo,tbrowder/rakudo,usev6/rakudo,sjn/rakudo,tbrowder/rakudo,nbrown/rakudo,tony-o/rakudo,jonathanstowe/rakudo,nbrown/rakudo,tbrowder/rakudo,samcv/rakudo,jonathanstowe/rakudo,jonathanstowe/rakudo,rakudo/rakudo,sjn/rakudo,nbrown/rakudo,Gnouc/rakudo,jonathanstowe/rakudo,salortiz/rakudo,sjn/rakudo,usev6/rakudo,usev6/rakudo,lucasbuchala/rakudo,MasterDuke17/rakudo,nbrown/rakudo,rakudo/rakudo,awwaiid/rakudo,nbrown/rakudo,samcv/rakudo,lucasbuchala/rakudo,labster/rakudo