Make the "Mac-like" or "canonical" app bundle structure always used on OS X

In other words, only executable files go in the MacOS folder. Dynamic
libraries and bundled frameworks (i.e., LibreOfficePython), and
nothing else, go in the Frameworks folder, and all other files go in
the Resources folder.

Especially, note that Java class files and rc (.ini) files also go in
Resources.

Such an app bundle structure is what Apple strongly suggests one
should use, and it has been hinted that future versions of code
signing and/or Gatekeeper will require such a structure.

There is still some ugliness thanks to traces of the historical
separation of URE from "the office". Like there are two separate
"unorc" files, one for URE, one for the LibreOffice application. IMHO,
this should be cleaned up, but is probably controversial.

(Eek! I now see there are actually *three* unorc files in the app
bundle. Not intentional. Need to fix that later.)

Change-Id: Idcf235038deb5b8e1d061734993e9f31869b7606