feat: add MeshPort overlay networking, item actions window, and AVA2 client enhancements

- add MeshPort peer-to-peer overlay networking SDK, C++ integration, and Python bindings
- add item actions quick use/split/delete/lock overlay window (mt_item_actions)
- add shop name range and NPC name visibility settings to system display options
- support battlepass ticket activation and month validation in mt_battlepass
- support boss tracking teleport destination button in mt_bosses
- support asynchronous account registration cancellation and pending login cancellation
- update AVA2 item conversion for attr lock scrolls and battlepass tickets
- update .gitignore for local build outputs and caches

src/platform/ScriptLib/FeatureServiceScript.inc

@@ -6,7 +6,7 @@ import net
 import ui
 from mt_wiki_data import Number
 
-BITS={'mob':1,'chest':2,'stats':4,'sources':8,'dungeons':16,'calendar':32,'bosses':256}
+BITS={'mob':1,'chest':2,'stats':4,'sources':8,'dungeons':16,'calendar':32,'bosses':256,'travel':512}
 WHOLE=('stats','dungeons','bosses') # one reply with every row; no subject or page
 g_service=None
 g_tick=None