fix: 修复聊天系统编译错误

- 修复 WebSocketManager/SocketIOClient 函数缩进错误
- 重命名 is_connected() 避免与 Object 基类冲突
- 修复 tscn 文件多余前导空格
- 修复测试文件 GUT 断言函数调用
- 添加 GUT 测试框架

addons/gut/gui/GutEditorWindow.gd

@@ -0,0 +1,88 @@
+@tool
+extends Window
+
+
+var GutEditorGlobals = load('res://addons/gut/gui/editor_globals.gd')
+
+@onready var _chk_always_on_top = $Layout/WinControls/OnTop
+
+var _bottom_panel = null
+var _ready_to_go = false
+var _gut_shortcuts = []
+
+var gut_plugin = null
+var interface = null
+
+
+func _unhandled_key_input(event: InputEvent) -> void:
+	if(event is InputEventKey):
+		if(_gut_shortcuts.has(event.as_text_keycode())):
+			get_tree().root.push_input(event)
+
+
+func _ready() -> void:
+	var pref_size = GutEditorGlobals.user_prefs.gut_window_size.value
+	if(pref_size.x < 0):
+		size = Vector2(800, 800)
+	else:
+		size = pref_size
+	always_on_top = GutEditorGlobals.user_prefs.gut_window_on_top.value
+	_chk_always_on_top.button_pressed = always_on_top
+
+
+# --------
+# Events
+# --------
+func _on_on_top_toggled(toggled_on: bool) -> void:
+	always_on_top = toggled_on
+	GutEditorGlobals.user_prefs.gut_window_on_top.value = toggled_on
+
+
+func _on_size_changed() -> void:
+	if(_ready_to_go):
+		GutEditorGlobals.user_prefs.gut_window_size.value = size
+
+
+func _on_close_requested() -> void:
+	gut_plugin.toggle_windowed()
+
+
+
+func _on_vert_layout_pressed() -> void:
+	_bottom_panel.results_vert_layout()
+
+
+func _on_horiz_layout_pressed() -> void:
+	_bottom_panel.results_horiz_layout()
+
+
+# --------
+# Public
+# --------
+func add_gut_panel(panel : Control):
+	$Layout.add_child(panel)
+	panel.size_flags_horizontal = Control.SIZE_EXPAND_FILL
+	panel.size_flags_vertical = Control.SIZE_EXPAND_FILL
+	panel.visible = true
+	_bottom_panel = panel
+	_ready_to_go = true
+
+	panel.owner = self
+
+	# This stunk to figure out.
+	theme = interface.get_editor_theme()
+	var settings = interface.get_editor_settings()
+	$ColorRect.color = settings.get_setting("interface/theme/base_color")
+
+	set_gut_shortcuts(_bottom_panel._ctrls.shortcut_dialog)
+
+
+func remove_panel():
+	$Layout.remove_child(_bottom_panel)
+	_bottom_panel.owner = null
+
+
+func set_gut_shortcuts(shortcuts_dialog):
+	_gut_shortcuts.clear()
+	for btn in shortcuts_dialog.all_buttons:
+		_gut_shortcuts.append(btn.get_input_event().as_text_keycode())