style: added TODO

Currently, `noLevelOrIsland and hasCorrectIslandRank` require the sign to be on an island. Currently this means the flag/level requirement are non-existent in the case of a sign being placed on a non-BSB island. This gives a possible solution if new API comes to light.

src/main/java/world/bentobox/warps/listeners/WarpSignsListener.java

@@ -158,6 +158,11 @@ public void onSignWarpCreate(SignChangeEvent e) {
             if (noPerms(user, b.getWorld(), inWorld)) {
                 return;
             }
+            // TODO: These checks are useless if the sign is placed outside a BSB world.
+            //  This will mean level and rank requirements are nil in the case of allow-in-other-worlds: true.
+            //  I'm not sure if there is a better way around this without adding new API checking for primary
+            //  or last island accessed with relevant permissions.
+            // ignored.
             if (inWorld && noLevelOrIsland(user, b.getWorld())) {
                 e.setLine(0, ChatColor.RED + addon.getSettings().getWelcomeLine());
                 return;