wayland: implement xwayland_shell_v1

wire/xwayland_shell_v1.txt

@@ -0,0 +1,8 @@
+# requests
+
+msg destroy = 0 { }
+
+msg get_xwayland_surface = 1 {
+    id: id(xwayland_surface_v1),
+    surface: id(wl_surface),
+}

wire/xwayland_surface_v1.txt

@@ -0,0 +1,8 @@
+# requests
+
+msg set_serial = 0 {
+    serial_lo: u32,
+    serial_hi: u32,
+}
+
+msg destroy = 1 { }