436524 - Start / Downloadable [files] references in modules cannot use ":" themselves

+ Switching out support for ":" to "|"
436520 - Start / Allow https and file urls in jetty-start's module download mechanism

+ Work to enable this mostly performed in Bug #436524
+ Some minor work to add more tests for this new syntax.
Fixing extraneous output and duplicate ${jetty.base}/${jetty.base} references when using --add-to-startd