Array: new class module.

* lib/zile/spec/Array_spec.yaml: New file. Specify behaviour of
a new Array class module.
* lib/zile/specs/specs.mk (specl_SPECS): Add it.
* lib/zile/Array.lua: New file. Object based alien arrays.
* lib/zile/zile.mk (dist_pkgdata_DATA): Add it.
* build-aux/config.ld.in (file): Add lib/zile/Array.lua.
* local.mk (dist_classes_DATA): Add generated Array LDocs.

Signed-off-by: Gary V. Vaughan <gary@gnu.org>