maint: use fully qualified api names in all deprecation messages.

* specs/list_spec.yaml (elems, index_key, index_value, relems)
(reverse, :depair, :map_with, :transpose, :zip_with): Specify
fully qualified api name in deprecation message.
* specs/string_spec.yaml (assert, require_version, tostring):
Likewise.
* specs/table_spec.yaml (clone_rename, metamethod, ripairs):
Likewise.
* lib/std/list.lua (elems, index_key, index_value, relems)
(reverse, :depair, :map_with, :transpose, :zip_with): Add `std.`
prefix to deprecation messages.
* lib/std/string.lua (assert, require_version, tostring):
Likewise.
* lib/table.lua (clone_rename, metamethod, ripairs): Likewise.

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