apath,resolve-alias: replace script for alias resolution

The new one will resolve multiple specified aliases and will attempt to use
the C aliasPath tool if it exists, falling back to finder (aliasPath reads the
path encoded in the alias file, so if the file was moved on disk, we still
need finder to tell us where it went, if it can).

Signed-off-by: Christopher Larson <kergoth@gmail.com>