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/gui/gut_user_preferences.gd

@@ -0,0 +1,79 @@
+class GutEditorPref:
+	var gut_pref_prefix = 'gut/'
+	var pname = '__not_set__'
+	var default = null
+	var value = '__not_set__'
+	var _settings = null
+
+	func _init(n, d, s):
+		pname = n
+		default = d
+		_settings = s
+		load_it()
+
+	func _prefstr():
+		var to_return = str(gut_pref_prefix, pname)
+		return to_return
+
+	func save_it():
+		_settings.set_setting(_prefstr(), value)
+
+	func load_it():
+		if(_settings.has_setting(_prefstr())):
+			value = _settings.get_setting(_prefstr())
+		else:
+			value = default
+
+	func erase():
+		_settings.erase(_prefstr())
+
+
+const EMPTY = '-- NOT_SET --'
+
+# -- Editor ONLY Settings --
+var output_font_name = null
+var output_font_size = null
+var hide_result_tree = null
+var hide_output_text = null
+var hide_settings = null
+var use_colors = null	# ? might be output panel
+var run_externally = null
+var run_externally_options_dialog_size = null
+var shortcuts_dialog_size = null
+var gut_window_size = null
+var gut_window_on_top = null
+
+
+func _init(editor_settings):
+	output_font_name = GutEditorPref.new('output_font_name', 'CourierPrime', editor_settings)
+	output_font_size = GutEditorPref.new('output_font_size', 30, editor_settings)
+	hide_result_tree = GutEditorPref.new('hide_result_tree', false, editor_settings)
+	hide_output_text = GutEditorPref.new('hide_output_text', false, editor_settings)
+	hide_settings = GutEditorPref.new('hide_settings', false, editor_settings)
+	use_colors = GutEditorPref.new('use_colors', true, editor_settings)
+	run_externally = GutEditorPref.new('run_externally', false, editor_settings)
+	run_externally_options_dialog_size = GutEditorPref.new('run_externally_options_dialog_size', Vector2i(-1, -1), editor_settings)
+	shortcuts_dialog_size = GutEditorPref.new('shortcuts_dialog_size', Vector2i(-1, -1), editor_settings)
+	gut_window_size = GutEditorPref.new('editor_window_size', Vector2i(-1, -1), editor_settings)
+	gut_window_on_top = GutEditorPref.new('editor_window_on_top', false, editor_settings)
+
+
+func save_it():
+	for prop in get_property_list():
+		var val = get(prop.name)
+		if(val is GutEditorPref):
+			val.save_it()
+
+
+func load_it():
+	for prop in get_property_list():
+		var val = get(prop.name)
+		if(val is GutEditorPref):
+			val.load_it()
+
+
+func erase_all():
+	for prop in get_property_list():
+		var val = get(prop.name)
+		if(val is GutEditorPref):
+			val.erase()