chore: add GUT test framework

addons/gut/scenes/TestPanelControls.gd

@@ -0,0 +1,25 @@
+extends Node2D
+
+var PanelControls = load('res://addons/gut/gui/panel_controls.gd')
+
+@onready var _ctrls = {
+	pc_vbox = $PanelControls/VBox
+}
+
+var _save_load = PanelControls.SaveLoadControl.new('whatever', 1, 'hint')
+var _res_dir = PanelControls.DirectoryControl.new('some dir', 'res://', 'hint')
+var _res_dir_enabled = PanelControls.DirectoryControl.new('other dir', 'res://', 'hint')
+
+
+func _ready():
+	#_save_load.dlg_load.show_diretory_types = false
+	#_save_load.dlg_load.show_user = false
+	#_save_load.dlg_save.show_os = false
+	
+	_res_dir_enabled.enabled_button.visible = true
+	
+	_ctrls.pc_vbox.add_child(_save_load)
+	_ctrls.pc_vbox.add_child(_res_dir)
+	_ctrls.pc_vbox.add_child(_res_dir_enabled)
+
+