chore: release version 2.3.5 and refactor lobby

Bump export_presets.cfg version to 2.3.5. Update CHANGELOG_DRAFT.md.
Refactor lobby.gd into LobbyChat, LobbyMainMenu, LobbyRoomList, LobbyRoom.
Move Nakama config to environment variables in nakama_manager.gd.
Derive auth_manager.gd encryption key from OS.get_unique_id().sha256_text().
Remove Steam email auth fallback. Require auth ticket.
Make GachaManager.pull() async in gacha_panel.gd.
Remove dummy wallet seeding. Add store_type to IAP payload.
Validate IAP receipts server-side in economy.lua.
Register gacha module in main.lua.
Clean backend_service.gd stubs.
Fix featured_banners type safety in gacha_manager.gd. Guards non-array responses.
Move tiles_armagedon_a1.res to assets/models/meshes/. Fix import fallback_path.

addons/gut/parameter_handler.gd

@@ -0,0 +1,36 @@
+var _params = null
+var _call_count = 0
+var _logger = null
+
+func _init(params=null):
+	_params = params
+	_logger = GutUtils.get_logger()
+	if(typeof(_params) != TYPE_ARRAY):
+		_logger.error('You must pass an array to parameter_handler constructor.')
+		_params = null
+
+
+func next_parameters():
+	_call_count += 1
+	return _params[_call_count -1]
+
+func get_current_parameters():
+	return _params[_call_count]
+
+func is_done():
+	var done = true
+	if(_params != null):
+		done = _call_count == _params.size()
+	return done
+
+func get_logger():
+	return _logger
+
+func set_logger(logger):
+	_logger = logger
+
+func get_call_count():
+	return _call_count
+
+func get_parameter_count():
+	return _params.size()