kiosk-shell: Introduce kiosk/fullscreen shell for desktop apps

kiosk-shell: Introduce kiosk/fullscreen shell for desktop apps

kiosk-shell is fullscreen shell for apps that use the xdg-shell protocol. The goal is to make life easier for people shipping embedded devices with simple fullscreen shell requirements, and reduce the proliferation of desktop-shell hacks.

Top level surfaces are made fullscreen, whereas dialogs are placed on top in the center of the output and retain their natural sizes. Dialogs can be moved and (un)maximized, but resizing is currently not supported.

An app can be directed to a particular output by populating the "app-ids" field with the app's XDG app id, in the relevant "[output]" section in the weston config file.