xdg-popup: implement jay-popup-ext-v1

wire/jay_popup_ext_manager_v1.txt

@@ -0,0 +1,7 @@
+request destroy (destructor) {
+}
+
+request get_ext {
+    id: id(jay_popup_ext_v1) (new),
+    popup: id(xdg_popup),
+}

wire/jay_popup_ext_v1.txt

@@ -0,0 +1,13 @@
+request destroy (destructor) {
+}
+
+request move {
+    seat: id(wl_seat),
+    serial: u32,
+}
+
+request resize {
+    seat: id(wl_seat),
+    serial: u32,
+    edges: u32,
+}