COMP: Do not explicitly fixup CLI shared libraries

Considering that (1) CLI shared lirbary are dependency
of CLI executable and (2) CLI executable are already discovered by the
fixup mechanism. There are no need to use candidate pattern for CLI
shared library.
COMP: Simplify expression used in gp_item_default_embedded_path_override.
STYLE: Easier configuration of fixup path in bundle script
BUG: Ensure library can be loaded from different place using @rpath

Before this commit, attempt have been made (r18311, r18325, r18581) to
install both built-in CLI and extension CLI executable in a folder
located at some depth of the main Slicer executable. This was needed
because all libraries were referenced based on the location of the main
Slicer executable using "@executable_path". This was working *only* in the
case of built-in CLI but wasn't scaling very well for the extension CLI
executable. Indeed, being able to both differentiate the different
installed extension and keeping the depth to 1 level wasn't easily
feasible:

  /path/to/Slicer.app/Contents/MacOS/Slicer
  /path/to/Slicer.app/Contents/cli-modules/MyCLI
  /path/to/Slicer.app/Contents/Extensions-21855/SkullStripper/cli-modules/MyCLI

A solution could have been to install extensions directly in "Slicer.app"
folder and update the cli install sub dir to get something like:

  /path/to/Slicer.app/Extensions-21855/SkullStripper/MyCLI

While possible, it would have remain a special case to maintain.

Instead, by using "@rpath", CLI modules can now be installed in the Slicer
standard location "Slicer_CLIMODULES_LIB_DIR" instead of "Slicer_CLIMODULES_SUBDIR".
This commit remove the special case which never worked (issue #3051)

Waiting the topic "tweak-bundleutilities-for-rpath" is fully matured and
integrated in CMake, use custom version of BundleUtilities and GetPrerequisites.
See http://cmake.org/gitweb?p=stage/cmake.git;a=shortlog;h=refs/heads/tweak-bundleutilities-for-rpath

Since our custom version of the CMake modules now consider "~/usr/.*/lib",
the implementation of "gp_resolved_file_type_override" has been removed.

Remove the hack specific to LibArchive (introduced by commit r19615), since
the library is fixed up using the default library matching pattern, it
will be installed in the expected location.

SlicerExecutionModel has also been updated to skip the installation of
CLI shared library and link the CLI executable with "-rpath" so that it
CLI executable can resolve the location of Slicer libraries.