~eliasnaur/giox

layout: update gio version

Signed-off-by: Elias Naur <mail@eliasnaur.com>
replace LICENSE with COPYING, LICENCE-MIT, UNLICENSE

The repository is still dual-licensed under the UNLICENSE or the
MIT, but the split files are more clear.

Signed-off-by: Elias Naur <mail@eliasnaur.com>
copy layout.Format from gio

Signed-off-by: Elias Naur <mail@eliasnaur.com>