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/editor_globals.gd

@@ -0,0 +1,68 @@
+@tool
+
+static var GutUserPreferences = load("res://addons/gut/gui/gut_user_preferences.gd")
+static var temp_directory = 'user://gut_temp_directory'
+
+static var editor_run_gut_config_path = 'gut_editor_config.json':
+	# This avoids having to use path_join wherever we want to reference this
+	# path.  The value is not supposed to change.  Could it be a constant
+	# instead?  Probably, but I didn't like repeating the directory part.
+	# Do I like that this is a bit witty.  Absolutely.
+	get: return temp_directory.path_join(editor_run_gut_config_path)
+	# Should this print a message or something instead?  Probably, but then I'd
+	# be repeating even more code than if this was just a constant.  So I didn't,
+	# even though I wanted to make the message a easter eggish fun message.
+	# I didn't, so this dumb comment will have to serve as the easter eggish fun.
+	set(v):
+		print("Be sure to document your code.  Never trust comments.")
+
+
+static var editor_run_bbcode_results_path = 'gut_editor.bbcode':
+	get: return temp_directory.path_join(editor_run_bbcode_results_path)
+	set(v): pass
+
+
+static var editor_run_json_results_path = 'gut_editor.json':
+	get: return temp_directory.path_join(editor_run_json_results_path)
+	set(v): pass
+
+
+static var editor_shortcuts_path = 'gut_editor_shortcuts.cfg' :
+	get: return temp_directory.path_join(editor_shortcuts_path)
+	set(v): pass
+
+static var run_externally_options_path = 'gut_editor_run_externally.cfg' :
+	get: return temp_directory.path_join(run_externally_options_path)
+	set(v): pass
+
+static var _user_prefs = null
+static var user_prefs = _user_prefs :
+	# workaround not being able to reference EditorInterface when not in
+	# the editor.  This shouldn't be referenced by anything not in the
+	# editor.
+	get:
+		if(_user_prefs == null and Engine.is_editor_hint()):
+			# This is sometimes used when not in the editor.  Avoid parser error
+			# for EditorInterface.
+			_user_prefs = GutUserPreferences.new(GutUtils.get_editor_interface().get_editor_settings())
+		return _user_prefs
+static var gut_plugin = null
+
+static func create_temp_directory():
+	DirAccess.make_dir_recursive_absolute(temp_directory)
+
+
+static func is_being_edited_in_editor(which):
+	if(!Engine.is_editor_hint()):
+		return false
+
+	var trav = which
+	var is_scene_root = false
+	var editor_root = which.get_tree().edited_scene_root
+	while(trav != null and !is_scene_root):
+		is_scene_root = editor_root == trav
+		if(!is_scene_root):
+			trav = trav.get_parent()
+	return is_scene_root
+
+