model loader: fixed bug where c.l.metadata was incorrectly added to other modules #1126

Also refactored it into a constant so we know where to look for it
Update ceylondoc test to not require stuff on Herd #1139
Update ceylondoc test to not require stuff on Herd #1139 (better
handling of free port)
Removed LazyUnit now that only c.l is auto-imported
metamodel test: updated to latest API #1126
metamodel: added c.l.untyped module #1126
updated test for #1133 with latest metamodel API changes #1126
TypeFactory: added getLanguageModuleMetamodelDeclaration for annotations and stuff, now that it's not auto-imported anymore #1126
Added `offline` option to the underlying javac compiler (#1121)
Added `offline` command line option to the tools that can establish network connections (#1121)
Added support for offline option (#1121)
Minor fix due to API change for offline mode (#1121)