Add éèàç directly to the layout, which removes the corresponding dead
keys.
Remove the requirement for ù and ÿ from method.xml, which are extremely
rare and can be typed via the compose key.
This separates the layout definitions from the special layouts
(bottom_row, greekmath) and other unrelated files (method, settings).
This is also a more intuitive location for layouts and make the resource
directory easier to navigate.
Under the hood, layouts are copied back into
build/generated-resources/xml.