Implemented lazy parsing of the structure from separate files.
Propagate a reference to the file being parsed (needed for the lazy structure parsing).
Put parsing into the parsed classes.
Simplified DirectoryScanner.
Enhanced Exists, LazyLoad, Names.

--HG--
rename : viewer/src/main/scala/org/podval/judaica/viewer/Soft.scala => viewer/src/main/scala/org/podval/judaica/viewer/LazyLoad.scala