Add CSD to border modes

This replaces view.using_csd with a new border mode: B_CSD. This also
removes sway_xdg_shell{_v6}_view.deco_mode and
view->has_client_side_decorations as we can now get these from the
border.

You can use `border toggle` to cycle through the modes including CSD, or
use `border csd` to set it directly. The client must support the
xdg-decoration protocol, and the only client I know of that does is the
example in wlroots.

If the client switches from SSD to CSD without us expecting it (via the
server-decoration protocol), we stash the previous border type into
view.saved_border so we can restore it if the client returns to SSD. I
haven't found a way to test this though.

sway/meson.build

@@ -10,6 +10,7 @@ sway_sources = files(
 	'security.c',
 	'server.c',
 	'swaynag.c',
+	'xdg_decoration.c',
 
 	'desktop/desktop.c',
 	'desktop/idle_inhibit_v1.c',