move add_display::View -> add_window::View & display_options::View -> window_options::VIew, remove displays logic and replace it with window ones

[skip ci]

dash-frontend/assets/gui/view/window_list.xml

@@ -0,0 +1,9 @@
+<layout>
+  <include src="../t_group_box.xml" />
+
+  <elements>
+    <rectangle macro="group_box" flex_direction="row" align_items="center">
+      <div id="list_parent" gap="8" flex_direction="row" flex_wrap="wrap" flex_grow="1" />
+    </rectangle>
+  </elements>
+</layout>